O2Cool Treva 10-Inch Portable Fan Review (Bought & Tested!)

This is my O2Cool Treva fan review. I put it through many different tests, all of which you’ll find below in this post.

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Quick Summary

If you’re looking for an affordable fan for RV camping, while occasionally taking it out tent camping, the O2Cool Treva is the perfect pick.

It’s not the best for uneven ground though, because of its narrow base, which is why I’d go for other camping fans instead.

RELATED: Best Camping Fan

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Check out the O2Cool Treva:

1. In the Box

I picked up this O2Cool Treva fan from Amazon, and here’s what it looks like still in its packaging:

And here’s everything I got out of the box:

• O2Cool Treva fan

• Supplied adapter (AC)

2. Fan Modes and Fan Speeds

The Treva fan has a two-speed operation – high and low speeds.

I bought a mini anemometer to test the wind speeds of each mode, and here are my results:

• High: 2.6-3 m/s or 8.5-9.9 ft/s

• Low: 2.2 m/s or 7.4 ft/s

3. Noise Level

And to test for the noise level, I also bought a sound meter, and here are my results:

• Off: 40.5 dBA

• Low: 53 dBA

• High: 57 dBA

Not the most minimal noise, but it has a relatively quiet operation.

4. Power Source #1 – D Batteries

Now, this Treva has 2 power sources, and the first is via six D-cell batteries.

The battery door is at the back and held together with screws (so you’d need a multi-tool or a screwdriver to get it open).

5. Run Times

When using the 6 D batteries, what are the run-times of this Treva fan? I couldn’t find any info on this at all, so I ran my own tests, and here are all my results:

• High: 60 hours (+5 hours of really light wind, which didn’t feel like much)

• Low: 85 hours

Note: I use Energizer Max batteries. If you use different ones, the run time will differ.

6. Power Source #2 – AC

The second power source is via this AC adapter port that came in the box.

The other end of the adapter is to go into the outlet of the fan. Wording underneat this outlet says ‘9V-DC, 700mA’.

Just plug the adapter in, and the batteries will automatically disconnect from the circuit, and the fan will start running.

7. Air Flow Distance

I used the same mini anemometer to test for airflow distance, and here are my results:

• High: 11.5ft / 3.5m

• Low: 7.8ft / 2.4m

However, I found that on the high mode, usable airflow came in only at about 6.7 feet, which is the size of a 4-person tent. I wouldn’t recommend it in anything bigger.

8. Base Stability

I also noticed that the base isn’t the biggest, it’s actually kind of narrow, and when I bring this camping, it’ll sometimes just fall over on its own, which isn’t great.

The fan on the right (yellow) is my Geek Aire Camping Fan, and is much more stable thanks to the wider base.

9. Handle/Groove

At the back of the Treva, there’s a finger groove for you to place your hand and pick up the fan. Not much of a handle, but it does work fine:

10. Waterproofing

The Treva doesn’t have an IP rating, so I tested it out in 30 minutes of heavy rain, and it held up fine:

However, the battery compartment had water all around the rims, so I definitely don’t think this is meant to take much rain.

11. Portability

As for weight, the Treva with six D batteries came in at about 64.4 ounces (1.8 kilograms).

The Treva alone (without the batteries) weighed 34.5 ounces (0.98 kilograms).

The packed size of the fan came in at 12 x 12.75 x 2.8 inches (30 x 32 x 7 centimeters).

12. Fan and Blade Size

As for the fan size, that’s slightly over 10.25 inches (26 centimeters).

Blade diameter is 9.25 inches (23.5 centimeters).

13. Materials

The entire fan is made of plastic, and it felt fine for the most part, but I thought the grills of the safety cage felt a little bit flimsy. You can easily just press it in with a little force.

It’s supposed to have a ‘patented fan blade design’ and a ‘sturdy plastic construction’, but I think that’s just marketing.

14. Pros, Cons, Recommendations

Pro 1: Low upfront cost

The number pro of this Treva is price, and that’s the main reason I bought it.

If you do a quick search on Amazon for a 10-inch portable fan, this is going to be one of the cheapest ones (last checked – 2025).

Pro 2: Big 10-inch fan face

The next pro is that even on the low mode, it moves quite a good amount of cool air, cos it’s so big, and it was able to cool me down quite a bit.

Plus, the adjustable speed settings deliver refreshing air through the high mode as well.

Pro 3: Good battery life

The run-times on this fan are good when powered by battery, between 60 to 85 hours, depending on which mode you use. That’s like almost an entire week of camping, which is great.

Pro 4: Dual power sources

The next huge pro of this fan is the 2 different power sources, and this is my only dual-power-sources personal fan:

• AC power

• D batteries x 6

Con 1: Not stable on uneven ground

The base is really narrow, a gust of wind can blow it over easily, so it’s not the best for tent camping.

Con 2: D batteries are expensive

I typically pay $1 to $2 for each D-battery, which means this 6 x D-battery powered fan will cost $6 to $12 for each use to stay cool.

Con 3: Lacks a lot of features

Also, this fan doesn’t have the most fan features:

• No sleep timer

• No battery lights

• No lighting / adjustable led lights

• No mobile charging or power bank function

• No rotation / adjustable tilt

• No warranty

Note: Some fans come with lanterns/flashlights. For example, the Coleman OneSource Fan comes with a neat little flashlight at the bottom.

Overall Recommendation

Otherwise though, the O2Cool Treva Portable Fan does what it’s supposed to do – it’s an affordable RV or desk fan (air circulating with two speeds), which you can sometimes take outdoors. If you have a stash of D batteries, this can be a great fan for power outages.

15. Bonus – MUST Read!

If you’re looking for a better camping fan, or even a camping lantern fan (2-in-1 comb) you’re in luck because I compared and tested 7 different camping ones.

Otherwise, check out the O2Cool Treva: