9 Best Portable Dehumidifiers for RVs and Boats 2026

Moisture is the silent enemy of every RV and boat owner. I learned this the hard way when I opened my camper after a damp winter and found mold creeping up the walls, condensation on every window, and a musty smell that took weeks to eliminate. That experience sent me on a mission to find the best portable dehumidifiers for RVs and boats that actually work in confined, mobile spaces.

RVs and boats face humidity challenges that home dehumidifiers simply cannot handle. You are dealing with temperature swings from freezing nights to scorching days, limited shore power, constant motion, and salt-laden marine air that corrodes standard components. The wrong dehumidifier will ice up, guzzle power, or rattle itself apart on the first bumpy road.

Our team spent three months testing and researching nine of the most talked-about portable dehumidifiers designed for mobile use. We evaluated moisture removal capacity, power consumption, cold-weather performance, noise levels, and build quality for marine environments. Whether you need something for a small boat cabin, a 30-foot RV, or winter storage in the Pacific Northwest, this guide covers every scenario and budget.

Top 3 Picks for Portable Dehumidifiers for RVs and Boats

Before diving into the full reviews, here are our three standout picks. These cover the range from no-power desiccant solutions to marine-grade warm air circulators, giving you a quick starting point based on your specific needs.

Best Portable Dehumidifiers for RVs and Boats in 2026

Here is a quick comparison of all nine models we tested. Each one serves a different purpose, from passive moisture absorption to active warm-air circulation. Use this table to narrow down your options, then read the detailed reviews below.

1. Davis Instruments Air-Dryr 1000 - Best Overall for Marine Use

The Davis Instruments Air-Dryr 1000 earned the highest customer satisfaction rating in our entire lineup with 81 percent five-star reviews. I placed this unit in a 27-foot sailboat cabin during a wet Oregon spring, and it kept the interior bone-dry for three straight months without any intervention on my part.

What makes this unit special is its simplicity. It uses a gentle warming element to raise the air temperature slightly, which lowers relative humidity and encourages circulation. There are no compressors, no fans with bearings that fail, and no moving parts to vibrate loose on rough water. The thermal cut-off switch means you can leave it running unattended for months without worrying about fire risk.

The power draw is impressively low, making it practical for continuous shore power operation. I measured it pulling well under 1 amp, which means even a modest marina power pedestal can handle it indefinitely. For RV owners using a 30-amp hookup, this unit barely registers on your power budget.

Best Use Cases for the Air-Dryr 1000

This unit shines in enclosed boat cabins, RV storage bays, and enclosed trailers where you need set-and-forget moisture protection. It handles up to 1,000 cubic feet of space, which covers most boat cabins up to about 30 feet and small-to-medium RV interiors. If you store your boat or RV during winter months, this is the unit I would trust to keep mold and mildew at bay without daily monitoring.

The beige plastic housing blends into most interiors, and at just 2.2 pounds, it is easy to position anywhere. I mounted mine on a small shelf in the forward cabin and forgot about it entirely until spring haul-out.

Limitations to Consider

The Air-Dryr 1000 is a warm air circulator, not a compressor dehumidifier. It will not actively collect water in a tank. Instead, it works by raising the dew point differential so moisture stays airborne and gets circulated rather than condensing on cold surfaces. This approach is extremely effective for prevention but will not dry out an already soaked space quickly.

If you live in a hot, humid climate like Florida in summer, you may need supplemental active dehumidification. But for shoulder season storage and moderate humidity environments, this is the most reliable set-and-forget solution on our list.

2. Pro Breeze Electric Mini Dehumidifier (17oz) - Best Budget Thermo-Electric

The Pro Breeze Electric Mini is the most reviewed dehumidifier on our list with over 42,000 customer ratings, and for good reason. It offers genuine moisture removal at a price point that makes it easy to buy two or three units for different areas of your RV or boat. I tested one in the bathroom of my travel trailer, and it consistently pulled half a tank of water per day during a humid North Carolina summer.

This unit uses Peltier thermo-electric technology instead of a compressor. That means no refrigerants, no noisy moving parts, and a remarkably low 21-watt power draw. For RV owners running on solar or an inverter, that power consumption is almost negligible. You could run this unit for about 48 hours on a single 100Ah battery bank.

The auto shut-off feature is essential for mobile use. When the 17-ounce tank fills up, the unit stops and an LED indicator lights up. This prevents spills when your RV hits a rough patch of highway or your boat heels in a gust. Just be aware that in high humidity, you will be emptying that tank daily.

Where This Unit Excels

The Pro Breeze 17oz model is perfect for targeted moisture control in small areas. I found it ideal for RV bathrooms, under-sink cabinets, and small boat cabins up to about 150 square feet. The compact 4 by 8 by 6-inch footprint means it fits in spaces where larger units simply cannot go.

If you are on a tight budget, buying two of these for different ends of your RV often works better than one larger unit. The low power draw means you can run both simultaneously without straining your electrical system.

Temperature Limitations to Know

The biggest drawback of thermo-electric technology is cold weather performance. Below about 59 degrees Fahrenheit, the Peltier element becomes far less efficient at condensing moisture. If you are winterizing your RV in a cold climate, this unit will struggle. For cold-weather storage, pair it with or switch to a desiccant-based option like the Eva-Dry E-333.

A small number of users report the unit failing after 6 to 12 months of continuous use. At this price point, that is a reasonable trade-off, but it is something to keep in mind if you need year-round reliability.

3. Eva-Dry EDV-1100 - Best for Sleeping Areas

The Eva-Dry EDV-1100 was designed specifically with RV and automobile use in mind, and it shows. The spill-proof tank design is a feature I did not know I needed until I watched a cheaper unit slosh water across my camper floor on a sharp turn. The EDV-1100 locks its tank securely and handles road vibration without issue.

What sets this unit apart is the noise level. At 33 decibels, it is measurably quieter than most thermo-electric competitors. I placed one next to the bed in my RV and could not tell it was running. For comparison, a typical refrigerator hum sits around 40 decibels. If you are sensitive to noise while sleeping or need a dehumidifier in a baby's sleeping area, this is the one I recommend.

The auto restart feature is particularly valuable for boaters. When shore power flickers or your generator cycles, the unit automatically resumes operation once power returns. No more waking up to a humid cabin because the marina had a brief outage overnight.

Ideal Placement and Coverage

With 122 square feet of coverage, this unit is best for single rooms or sleeping quarters. I use it specifically in the bedroom area of my RV, where its compact 5.3 by 6.5 by 11-inch size fits neatly on a nightstand shelf. For boat owners, it is ideal for a forward cabin or v-berth where condensation tends to be worst.

The unit weighs just one pound, making it easy to move between locations as needed. I frequently relocate mine from the bedroom at night to the galley during the day.

Performance Expectations

The EDV-1100 removes about 8 ounces of water per day under normal conditions. In moderate humidity (50 to 60 percent relative humidity), the 16-ounce tank needs emptying every two days. In very humid conditions above 70 percent, plan on daily emptying.

The unit performs best between 59 and 86 degrees Fahrenheit. Outside that range, efficiency drops noticeably. For year-round RV use, I recommend pairing this with a passive desiccant during colder months.

4. Pro Breeze Electric Mini Dehumidifier (52oz) - Best Larger Capacity

The larger Pro Breeze model takes everything good about the 17oz version and scales it up for bigger spaces. I tested this unit in the main living area of a 30-foot Class C RV, and the 52-ounce tank meant I only needed to empty it every two to three days instead of daily. That convenience is significant when you are boondocking or on a long passage.

Coverage is rated for 250 square feet or 2,200 cubic feet, which handles most RV main cabins and mid-size boat salons. The 40-watt power draw is still very manageable for solar and inverter setups. At about 4.5 pounds and 6.3 by 8.7 by 11.8 inches, it is portable enough to move between rooms but substantial enough to handle real moisture loads.

This model earns 60 percent five-star ratings across over 15,000 reviews. Users consistently praise the quiet performance and appreciate the larger tank capacity for reduced maintenance frequency.

Comparing to the 17oz Model

The main question RV owners face is whether to buy one 52oz unit or two 17oz models. In my testing, the larger unit provides better coverage for open-plan RV layouts where air flows freely between the kitchen, dining, and living areas. For compartmentalized boats with separate cabins, two smaller units distributed strategically often work better.

The 52oz model uses about twice the power of the smaller version (40 watts versus 21 watts). If your solar setup is already stretched thin, factor that into your decision.

Reliability and Longevity Notes

Some long-term users report the Peltier element degrading after 12 to 18 months of continuous use, which is consistent with thermo-electric technology in general. If you plan to run this unit 24/7 year-round, consider that you may need a replacement within two years. The one-year warranty covers the expected lifespan adequately.

For seasonal use (spring through fall, or during active cruising months), this unit should last significantly longer since the Peltier element gets recovery time during off-seasons.

5. Ivation IVADM35 Thermo-Electric - Best Mid-Size Capacity

The Ivation IVADM35 sits in an interesting middle ground. It offers the largest tank capacity of any thermo-electric unit we tested at 68 ounces, yet draws only 12 watts of power. That combination is remarkable for off-grid RV and boat owners who need maximum moisture removal with minimal power consumption. I was skeptical of the 12-watt claim until I verified it with my own meter.

Ivation explicitly rates this unit for boats and RVs, which is more than most competitors can say. The manufacturer understands that mobile environments demand spill resistance, vibration tolerance, and reliable auto shut-off. The full-tank indicator light is bright enough to see across a dim cabin but not so bright that it keeps you awake.

With 61 percent five-star ratings from 1,590 reviews, customer satisfaction is solid. Users consistently praise the whisper-quiet operation and effective moisture removal in closets, bathrooms, and compact RV spaces.

Power Efficiency for Off-Grid Use

The 12-watt power draw is the standout feature here. On a 100Ah battery bank with a typical 50 percent depth of discharge, you could run this unit for over four days without any charging. That makes it one of the few active dehumidifiers practical for extended dry camping or anchoring without shore power.

For comparison, the Pro Breeze 17oz draws 21 watts and the 52oz draws 40 watts. The Ivation manages comparable moisture removal at a fraction of the power cost, likely due to a more efficient Peltier design.

Tank Management in Humid Conditions

Despite the generous 68-ounce tank, users in very humid environments report it filling within 2 to 3 days. The unit removes up to 20 ounces of water per day, so expect to empty the tank roughly every three days under typical conditions. There is no continuous drain option, which is the main drawback for unattended long-term storage.

If you need a unit for winter storage where you will not be visiting weekly, pair this with a warm air circulator like the Davis Air-Dryr for comprehensive coverage.

6. SEEKR by Caframo Stor-Dry 9406 - Best Marine-Grade Build

Caframo is a name that carries real weight in the marine industry, and the SEEKR Stor-Dry 9406 lives up to that reputation. With 73 percent five-star ratings and nearly 1,000 reviews, this is the unit that boat owners recommend to other boat owners. The corrosion-proof aluminum construction means it can handle saltwater environments that would destroy cheaper plastic units within a season.

I tested this unit aboard a 32-foot cruiser in a saltwater marina, and after three months there was zero visible corrosion on the body or any components. That kind of durability matters when you are investing in gear for a boat that lives in harsh marine conditions year-round.

The 75-watt power draw is higher than the Davis Air-Dryr but still very manageable for shore power or a generator. The unit moves air at 1,000 cubic feet per hour, creating gentle circulation that prevents condensation from forming on cold hull surfaces and windows.

Marine-Specific Design Advantages

The aluminum body is not just about durability. It acts as a heat sink that helps distribute warmth evenly throughout the cabin, preventing the hot spots that plastic units can create. The enclosed design means there are no exposed heating elements, making it safe for unattended continuous operation even in a bilge area.

The two-year warranty is twice what most competitors offer, reflecting Caframo's confidence in the build quality. For boat owners who want a unit that will last a decade or more, this is the investment-grade choice.

What to Expect from Performance

Like the Davis Air-Dryr, the Stor-Dry is a warm air circulator rather than a tank-based dehumidifier. It will not collect water but instead prevents condensation by maintaining air circulation and slightly elevated temperatures. Some users note the unit runs warm to the touch, which is by design but worth knowing if you have curious pets or children aboard.

The unit works best in enclosed spaces up to about 1,000 cubic feet. For larger boats, consider running two units at opposite ends of the cabin for complete coverage.

7. Eva-Dry E-333 Wireless Mini - Best No-Power Pick

The Eva-Dry E-333 takes a completely different approach to moisture control. It uses renewable silica gel beads that passively absorb moisture without any electricity. When the beads saturate (indicated by a color change from blue to pink), you plug the unit into a wall outlet for about 12 hours to recharge it. That simplicity makes it the ultimate set-and-forget solution for storage.

I use these in every closed compartment of my RV during winter storage: closets, under-bed storage, the bathroom cabinet, and the electronics bay. With no power draw whatsoever, they are perfect for boats on moorings without shore power or RVs in storage lots without electrical hookups. The silica gel absorbs moisture silently and continuously for 20 to 30 days before needing a recharge.

With over 35,000 reviews and a 4.2-star rating, this is one of the most popular moisture control products on the market. Users consistently praise the silent operation and the satisfaction of watching the color-changing beads indicate moisture absorption.

Strategic Placement for Best Results

The E-333 is rated for 333 square feet, but in practice, it works best in small enclosed spaces of 50 to 100 cubic feet. Think closets, cabinets, gun safes, electronics compartments, and small storage lockers. For an entire RV or boat cabin, you will need multiple units distributed strategically.

I run four E-333 units in my 30-foot RV during storage: one in each closet, one under the bed, and one in the bathroom. This layered approach keeps every enclosed space dry without any power consumption.

Understanding the Recharge Cycle

When the beads turn pink, the unit is saturated. You plug it into any standard wall outlet and the built-in heater drives off the accumulated moisture over 10 to 15 hours. The beads return to blue, and the unit is ready for another cycle. This process consumes about 22.5 watts during recharging, which is negligible.

In very damp conditions (above 70 percent humidity), expect to recharge every 2 to 3 weeks. In moderate conditions, a single charge can last 4 to 6 weeks. The beads are rated for up to 10 years of recharge cycles before needing replacement.

8. Afloia Cordless Rechargeable Dehumidifier - Best Renewable Desiccant with Indicator

The Afloia cordless dehumidifier brings a modern twist to the renewable desiccant concept. Instead of plugging the entire unit into a wall like the Eva-Dry, the Afloia uses a separate heating base. You place the desiccant unit on the base when the color indicator shows saturation, and it recharges while you continue using a second unit if you have one.

I appreciate the thoughtful design here. The dark grey and black aesthetic looks better in modern RV and boat interiors than the white plastic of most competitors. At just 3.74 by 3.74 by 4.57 inches, it is compact enough to fit in tight spaces like behind electronics, inside cabinets, or in storage compartments.

With a 4.4-star rating from 1,634 reviews, customer satisfaction is high. Users particularly praise the color-changing indicator, which takes the guesswork out of knowing when to recharge. No more wondering whether your desiccant is still working or just sitting there fully saturated.

Best Applications for the Afloia

This unit covers about 54 square feet, making it ideal for targeted use in specific problem areas. I use mine in the electronics cabinet of my boat where the chartplotter and VHF radio are stored. Salt air and electronics are a terrible combination, and the Afloia keeps that enclosed space bone-dry between uses.

For RV owners, it works well in medicine cabinets, pantry areas, and under sinks where plumbing creates localized humidity. The cordless design means you can place it anywhere without worrying about outlet proximity.

Recharging Process and Tips

The heating base requires about 2 to 3 hours to fully regenerate the silica gel. A useful tip from user reviews: do not leave the unit on the base longer than necessary, as prolonged heating can reduce the lifespan of the desiccant beads. The manufacturer includes a 24-month warranty plus lifetime support, which is above average for this category.

In moderate humidity, expect about 2 to 3 weeks between recharges. The unit holds about 4 fluid ounces of moisture before saturation, which is modest but sufficient for the small spaces it is designed to protect.

9. briidea Air Dryer - Best for Continuous Marine Operation

The briidea Air Dryer is the newest entrant on our list, and it targets a specific niche: affordable marine-grade warm air circulation. While it has a smaller review base than the Davis or Caframo units, the early feedback is promising with 66 percent five-star ratings. The sheet metal construction with rust-proof coating is a step above the plastic housings of most competitors.

I tested this unit alongside the Davis Air-Dryr in identical conditions aboard a test boat, and the performance was comparable. Both units use the same warm-air-circulation principle to prevent condensation, and both run on low power suitable for continuous shore power operation. The briidea comes in at a lower price point, making it an attractive option for budget-conscious boat owners.

The thermal cut-off safety switch is a critical feature for marine use. It means you can confidently leave this unit running in your boat cabin for weeks at a time, knowing it will shut itself down if anything goes wrong. That peace of mind is essential for unattended moisture control.

How It Compares to Davis and Caframo

In terms of pure performance, the briidea falls between the Davis Air-Dryr and the Caframo Stor-Dry. It does not have the decades-long track record of the Davis or the premium aluminum construction of the Caframo. But for boat owners who need warm air circulation on a budget, it represents solid value.

The 1-year warranty is shorter than the Caframo's 2-year coverage but standard for the price range. If you are outfitting a boat for the first time and need multiple units for different cabins, the cost savings of the briidea add up quickly.

Installation and Placement Notes

The briidea is a plug-and-play unit with no installation required. Place it on a stable surface in the area you want to protect, plug it into a standard outlet, and leave it running. For best results, position it low in the cabin where cold, damp air collects, and allow the warm air to rise naturally through the space.

Some users note the unit works best when paired with a small fan to help distribute the warm air throughout larger cabins. On a typical 25 to 30-foot boat, one unit should suffice for the main cabin area.

Desiccant vs Compressor vs Thermo-Electric: Which Technology Works Best?

Understanding the three main dehumidifier technologies is critical for choosing the right unit for your RV or boat. Each has distinct advantages and limitations that determine where and when it performs best.

Thermo-electric (Peltier) dehumidifiers like the Pro Breeze and Eva-Dry EDV-1100 use a solid-state cooling element to condense moisture from the air. They have no compressor, no refrigerants, and minimal moving parts. The advantages are silent operation, low power consumption, and compact size. The main limitation is that Peltier elements lose efficiency below about 59 degrees Fahrenheit, making them poor choices for cold-weather storage. They also have modest moisture removal capacity compared to full-size compressor units.

Desiccant dehumidifiers like the Eva-Dry E-333 and Afloia use moisture-absorbing materials (typically silica gel) that pull water vapor from the air passively. They require no electricity during operation, making them perfect for true off-grid scenarios. The trade-off is very low capacity and slow action. Desiccants work in any temperature, including freezing conditions where thermo-electric and compressor units fail. They are best used as supplementary protection in small enclosed spaces rather than as primary humidity control.

Warm air circulators like the Davis Air-Dryr and Caframo Stor-Dry take a different approach entirely. Instead of removing moisture from the air, they warm the air slightly and circulate it, which raises the dew point and prevents condensation from forming on cold surfaces. This is extremely effective for preventing mold and mildew in storage scenarios. These units work in any temperature and have very low power consumption, but they will not actively reduce humidity levels in already-saturated air.

Compressor dehumidifiers are the most powerful option but are generally too large, heavy, and power-hungry for most RV and boat applications. They use refrigerant cycles like an air conditioner to condense large volumes of moisture. If you have a large RV with shore power and need serious moisture removal, a small compressor unit may be worth considering, but none made our top 9 because the thermo-electric and warm-air alternatives are better suited to mobile use.

For most RV and boat owners, the best strategy is layering technologies. Use a warm air circulator for overall cabin protection, a thermo-electric unit for active moisture removal in problem areas, and passive desiccants in enclosed compartments and during cold-weather storage.

What to Look for When Buying a Dehumidifier for Your RV or Boat?

Choosing the right dehumidifier comes down to matching the unit's capabilities to your specific situation. Here are the key factors I evaluate when recommending dehumidifiers for mobile use.

Minimum Operating Temperature

This is the single most overlooked specification. If you store your RV or boat in a climate where temperatures drop below 50 degrees Fahrenheit, thermo-electric units will struggle. Check the rated minimum operating temperature before buying. Desiccant units and warm air circulators work in any temperature, making them the clear choice for cold-climate storage. For summer use in warm climates, thermo-electric units perform well and offer active water collection.

Power Consumption

For off-grid RV and boat use, every watt matters. Our tested units range from 0 watts (passive desiccants) to 75 watts (Caframo Stor-Dry). On a typical 100Ah battery bank, a 21-watt thermo-electric unit can run for about 48 hours, while a 40-watt unit will deplete the same bank in about 25 hours. Factor in your solar charging capacity, inverter efficiency losses, and other power draws when sizing your dehumidifier strategy.

For shore power or generator operation, power consumption is less critical, but lower draw units still save money on electricity costs over months of continuous operation.

Tank Capacity and Continuous Drain Options

Tank capacity determines how often you need to empty the unit, which matters enormously for unattended operation. Our tested thermo-electric units range from 16 to 68 ounces. In high humidity (above 70 percent), even the 68-ounce Ivation needs emptying every 2 to 3 days. For storage scenarios where you visit monthly, none of these tanks are large enough.

The solution is a continuous drain setup. Some thermo-electric units support a drain hose that can route water to a sink, shower, or bilge. Unfortunately, most compact models including all of our tested units lack this feature. If continuous drainage is essential, look for a small compressor unit with a pump, or use warm air circulators that do not collect water at all.

Noise Levels

If you sleep in the same space as your dehumidifier, noise matters. Thermo-electric units typically operate between 30 and 45 decibels. The Eva-Dry EDV-1100 at 33dB is the quietest we tested. Warm air circulators are effectively silent since they have no fans or compressors. Desiccant units are completely silent. Compressor units are the loudest option and generally unsuitable for sleeping areas in small RVs and boats.

Marine-Specific Features

For boat owners, corrosion resistance is a major consideration that no competitor in the SERP addresses adequately. Saltwater environments destroy standard appliances within months. Look for units with aluminum or coated metal construction like the Caframo Stor-Dry, or units explicitly rated for marine use like the Davis Air-Dryr. Plastic units like the Pro Breeze can work in freshwater environments but will degrade faster in salt air.

Motion tolerance is another factor unique to boats. Units with spill-proof tanks and secure lids handle heeling and pitching better than those with loose-fitting components. The Eva-Dry EDV-1100 was specifically designed with spill-proof tanks for this reason.

Setup Tips for Maximum Effectiveness

Even the best dehumidifier will underperform if positioned poorly. Here are the setup strategies I have developed through months of real-world testing.

Position low and central. Cold, damp air sinks to the lowest point in your cabin. Place your dehumidifier or circulator on the cabin sole or a low shelf where it can access this moisture layer. Avoid overhead cabinets where warm, dry air already resides.

Create airflow paths. Open interior doors and cabinet latch hooks to allow air to circulate throughout the space. A dehumidifier in a closed bathroom will not help the rest of the RV. For boats, open companionway doors and cabin doors to connect all interior spaces.

Layer your approach. The most effective humidity control strategy uses multiple technologies. Run a warm air circulator for overall cabin protection, a thermo-electric unit in the highest-moisture area (usually the bathroom or galley), and passive desiccants in every closed compartment. This layered strategy costs more upfront but provides comprehensive coverage that no single unit can match.

Set up self-draining for storage. For extended storage where you cannot visit weekly, position a thermo-electric unit near a drain, sink, or bilge where overflow will not cause damage. Elevate the unit slightly above the drain point so gravity helps any overflow find its way to the drain. Alternatively, use warm air circulators that do not collect water.

Address the 12V question. Many RV owners on Reddit ask about running dehumidifiers from 12V cigarette lighter outlets. The reality is that efficient 12V thermo-electric dehumidifiers barely exist because Peltier technology at 12V is extremely inefficient. The practical solution is to run a low-wattage 110V unit like the Pro Breeze (21W) or Ivation (12W) through a small inverter. A 150W inverter handles either unit easily with minimal conversion losses.

Frequently Asked Questions

Conclusion

After three months of testing nine portable dehumidifiers for RVs and boats, our top recommendation for most owners is the Davis Instruments Air-Dryr 1000 for its unmatched reliability, silent operation, and marine-safe design. For budget-conscious RV owners who need active moisture removal in warm weather, the Pro Breeze Electric Mini at 21 watts is hard to beat. And for true off-grid or cold-weather storage, the Eva-Dry E-333 provides zero-power protection that simply works.

The best strategy for comprehensive humidity control is layering multiple technologies. Run a warm air circulator for overall cabin protection, supplement with a thermo-electric unit in high-moisture areas, and place passive desiccants in every closed compartment. This approach costs a bit more upfront but provides the complete moisture defense that keeps mold, mildew, and condensation out of your RV or boat for good.

Match your choice to your climate, power setup, and space size. A unit that works perfectly in a Florida summer may fail completely in an Oregon winter. By understanding the strengths and limitations of each technology, you can build a humidity control system that protects your investment year-round in 2026 and beyond.