Treva 10-Inch Portable Fan, Powered by Battery and/or AC Adapter - Desk Fan Air Circulating with 2 Cooling Speeds for Personal and Travel Use (White)

A power outage in the height of Texas summer is just about the worst thing that can happen. During one that lasted several hours, I ended up driving across town and taking my elderly dog shopping, just to get her inside somewhere that had a/c. More recently, we've had some short power outages, lasting maybe an hour each. Still, that's enough time for my apartment to go from slightly-warmer-than-I'd-like to my-living-room-is-a-burning-hell. Looking for a back-up plan, I decided to see if battery operated fans were even a thing, and that's when I found this O2Cool fan. I was a little nervous about buying it, since a few reviewers said theirs didn't work or didn't last, but a few reviews from hurricane areas had me wanting to give it a try. So I ordered one and crossed my fingers.TL;DR: Awesome fan, works great!First off, I like the size and design. This isn't one of those tiny palm-sized USB fans; it's about a foot wide in total, with a 10" span inside for the actual fan blades. It's slightly taller than it is wide, but it's depth is pretty compact. The vented cover is sized just right for me to not accidentally slip a finger inside when I pick it up, though it does have a carrying handle if you want to play it really safe. It does come with an A/C adapter, which I guess is nice, but I don't really need. Then again, it may come in handy if one of my two regular fans goes out and I need a temporary replacement.It's kind of a battery hog in that it needs 6 D-batteries to run, but honestly, I think that's a good thing. Any less, and it'd be a much smaller, weaker fan that wouldn't last any time at all. I haven't had occasion to run it for hours and hours and hours, but according to other customers, it lasts 9+ hours on high and even longer on low. I think that will be plenty to get me through the next power outage. And about those low and high speeds... This thing has great air flow. I wouldn't want to set it up 10 feet away from me, but since it's not tied to a cord or outlet, that won't be a problem. On low speed, there's plenty of air flow, and on high speed, it's awesome. It's slightly less powerful than the 22" corded turbo fans I use on a daily basis.All in all, I'd say this is an awesome buy. I was impressed enough with the first one that I immediately ordered a second, and both work very well with both the A/C adapter and batteries. I'm stocked up on D batteries now, too, so it looks like I'm set to ride out the next power outage in comfort!Update 12/1/2108: I bought two of these fans to get me through a power outage, which hasn't happened yet. But a few weeks ago, my apartment's a/c went out in the middle of the night, and the two fans I brought into the bedroom just weren't enough. I ended up grabbing one of these battery operated fans, intending to use the included A/C cord, and set it up on my nightstand. But in my sleepy, overheated stupor, I turned it on and quickly fell asleep -- forgetting to plug it in. Six hours later, I woke up and called maintenance, and they had my a/c fixed fast. Then I went to unplug and put away this fan, only to realize I'd left it running on high for 6 hours on nothing but battery power! So yes, I can now say without a doubt that these little fans run great for at least several hours.Update: Here I am. Power outage. Texas. Summer. While my neighbors sit in their doorways trying to catch a weak breeze, my dog and I are comfortably lounging on the sofa, a fan trained on each of us, while she sleeps and I read my Kindle. This is EXACTLY the scenario I wanted to be prepared for, and these fans are everything I'd hoped for!

Treva 10" fan, works on six "D" batteries or on electric power. Quiet, 2 speeds and very good air power output. Only issue and not a deal breaker is the difficulty putting the cover back on after installing the batteries. You have to press down on the cover while sliding the it across 2 connecting points. Easier said than done and concerned it could break while doing so.

This is very quiet fan. it has 2 speeds to choose from. What I love about it’s the ability to use regular D batteries instead of charging!! You can also plug it to your regular AC outlet!! Amazing!! This is a great emergency alternative in case of a power outage!! Excellent design, I will definitely buy it again!!!

It was described correctly and what I expected. Nice product. Never used it.

This is a very quiet fan. Great if you don't want your hair and /or papers flying around as if a tornado. Two speeds provide a nice, gentle breeze. Extra great fan due to optional battery power available. I highly recommend this fan.........I had to purchase another I was so happy with the first one.

I have been using this fan since December 2014 and it has been perfect. I originally bought this fan to use in my dorm because last semsester (fall 2014) the ac in my (low cost / old) dorm stopped blowing cool/cold air. It only blew out very hot air. I was left to the mercy of the university to send someone out to fix since we are not allowed to mess with at all. That person never came so rather than allow the hot air to blow and bake me to death, I just had to completely shut it off ( my dorm still uses individual ac units that are attached to the windows lol ) but doing so just leaves the air very stuffy and basically zero circulation in my room. That's why I bought this, sorry if it is too much but I feel it demonstrates what I was looking for in a fan when I went shopping on amazon for one.here are the pro's and conspros:Size is perfect for sitting on a desktop in the corner. I can set it in the corner and be able to utilize my desktop for either my laptop or for Home Work.To my amazement this little fan blows air very well. It has two settings for how hard it blows air. the lowest is usually enough for me since I have facing towards my face on my desktop but even on the highest I don't get that feeling of being smacked in the face by the air.It isn't "weak" but it isn't powerful like an industrial fan. If need a heavy duty fan then buy an industrial one. I obviously don't need such a large fan in my dorm and doubt it would even be allowed.Fairly quiet and sound isn't annoying. I find it soothing when my dorm room is completely silent.I use the adapter and don't really use the batteries because I leave it on almost all day 24/7. So I am able to tell you how long it lasts on batteries but it requires 4 D batteries so it should last a decent amount.Cons:nonewill keep review updated on status on my fan or if it ever "goes out".The price on this is very reasonable. I didn't want a complicated / high-tech fan that had tons of settings. I just wanted something simple but functional and durable. Looking at the reviews on amazon I decided this O2COOL fan W/adapter was just what I was looking for.

I took this on a car camping trip where I didn’t want to have to keep charging a fan. The batteries lasted 4 days and still going strong!! The fan is big enough to make a difference and small enough to pack. I never write reviews but wanted to sing the praises of this!

I got this fan because of the current heatwave. I needed a fan that could be battery operated as we have at least 1-2 power outages in the summer. This fan can so be plugged in, which is a huge bonus since batteries are expensive. I love being on my balcony and I can sit outside with this fan and my shade cloth in mid-90s temps. I also love it on my bedroom night stand when sleeping. Keeps me cool enough on the lower speed that I can set the thermostat higher and save $$ on central air overnight.

Compre 2 ventiladores de esta marca por los comentarios tan favorables que leí, ya se puso las pilas que necesitan también compré aqui en Amazon , los probe y funcionan bien ,

As everyone else mentioned... does not run the same on batteries. I am happy with the item as it is doing as well as can be expected. Also it is very difficult to close the battery compartment.I was shocked about the difficulty with cleaning. You have to remove about eight screws with a specialty screwdriver... long handled.Overall ok with it... would I buy again. No... It a little cheaply made for my taste.

works great - been a few weeks now and it goes 24 - 7 circulating heat from woodstove in kitchen to rest of house and it moves enough air to keep house warm and it nice and quiet too - have not tried it on batteries yet - but thought it be handy to keep air moving even when hydro goes off, was a good price , very fast shipping - I happy

Brilliant battery fan, so powerful and well constructed. Bought for here in Australia for when we have blackouts which are a common occurrence in summer. Used it twice when power cut out and it was a 43”C day, worth the wait in having it shipped from America, subsequently bought another for myself and one each for relatives. Makes so much sense having this as a backup cooling system. Fantastic brand, sturdy and affordable. Totally recommend.

Works a treat xx good fan for if you have to leave dogs in the car for couple of minutes ....With windows ajar as well , but keeps air circulating . Will be great for use in caravan awning as well