Treva 10 in Portable Desktop Battery Fan 2-Speed with AC Adapter Graphite

This fan is amazing!! It fits perfectly in my carry-on and had kept me cool all over the world. A perfect travel companion for stuffy rooms with no AC. The sound is a great white noise for sleeping. It has 2 speeds and can be angled to blow right on you or more up to the ceiling. I never travel without it.

Original post: We used this on a three-night camp trip into southern Iowa in August. It made all the difference for getting a good night's sleep. It created enough of a breeze on the low setting to give relief without blowing too hard. On the low setting there wasn't quite enough white noise to cover campground sounds or animals treading about but the high setting did a good job of covering noise. The batteries gave enough weight in the base for it to remain upright all night. We like that it folds up to a very portable size and doesn't take up much room among the camp gear. Update one year and three months after purchase: We returned the original purchase as it was defective and got a replacement without any issues. Very reliable fan. Ended up using it in the bedroom for white noise on the low setting. Folded up, it propped easily into the window. The high setting brought in enough evening air to cool the room for night sleeping and the low setting is perfect white noise. It has run for eight hours a night for 15 months. Other fans we've had tended to develop vibration noises after several months, very annoying and not conducive to falling asleep. Not this one. It sounds and performs the same as the day it came out of the box. The only caveat I have to add is that the covering on the cord separated near the fan body's plug-in point, exposing the little wires within AC adapter cord. It came as a result of the cord bending downward at the connector every night to plug into an outlet below the window. It's beyond repair and needs replacement. We tried a couple of power adapter cords from several electronic devices we have but none worked. I see that a replacement AC adapter cord is available from the manufacturer for $12, about half the price of the unit itself. Based on the performance of the fan, we figure it's worth it. The old cord will go to electronic recyclers. As a precaution, so the same thing doesn't happen again on the new cord, we'll probably wrap some electrician's tape around the first couple of inches at the connection to support and ease the bend in the cord. Overall, it's been a good little fan and worth the purchase. UPDATE FOUR YEARS AFTER PURCHASE: still going! Still using it every single night for white noise. Sometimes it makes a little squealing noise for a couple of seconds but giving it a quick smack makes it stop.

This is actually my 3rd O2Cool fan, I like them, a LOT, but they keep seeming to grow feet and walk off every few hunting seasons. More specifically in a rush to get back to civilization before the ultra nasty weather sets in, somebody forgets to haul the battery fan out of the rented bunk house and it is never there when we get back next year... These fans have been around for quite some time now, this is the first I have found them on Amazon. Over the years a couple of things have changed, and this one has an annoying change, but let's start with the good shall we? The good. I have never had one of these die on me aside from batteries running out, not the fans fault per se. Durability with my use is good. I use this to shove heated air from a Mr. Heater Portable buddy around the bunk house, or tent to allow the heat to circulate instead of simply rise straight up and throgh the ceiling. It makes a massive difference in comfort anywhere away from the heater. And no, do NOT place this too close to the front of the heater! Operation is simple and smooth. I use the Amazon basics batteries for this, I need to upgrade to rechargeable D cells but have been too cheap to do so as of yet.... Battery life is good, can't really say how long because I don't run it 24x7, but on our camping trips we average 6 hours run time a night for weekend trips (2 nights) and a set of batteries has been known to last a full camping season. Compared to the earlier model with the swing over handle, and more rigid glossy plastic housing, this newer model seems more ruggedly built, fewer moving plastic parts to fail, a smoother switch, overall better fit and finish. Like I said the earlier model had a swing over handle that had to be more expensive to manufacture vs. the extended lip landle on the top of this thing, but the newer handle design I would think would be far less likely to be a failure point. Keep it simple. The one place where they made a change that left me scratching my head and I do not feel is an improvement is the closures for the battery compartment. Previously they were slide latches that you simply slide over with your fingers, the new design requires some sort of straight edge tool like a screwdriver, a coin, or a swiss army knife to open up, all of which I have in camp, it's just an extra step, and additional engineering that made me wonder why they bothered changing it. It makes the battery compartment harder to get into. Earlier models you could buy an additional AC transformer to run the fan off of wall power. Mind you, when I camp, if I have 110V power available, I am going to use an electric heater with a built in fan and don't need this, BUT I can see for RV users and whatnot, they might want this. The good thing is this newer version included the transformer, and unfortunately no way to stow it. Perhaps in future iterations they might consider designing in on board storage for the transformer to reduce the odds of it getting lost between uses. Overall I think it's a great little fan, 2 speeds, more than enough power to move air through a 10x12 family tent or 10x16 bunkhouse / hunting shack. If you need very portable, energy efficient, reliable, and effective air moving for a small space, this would be a highly recommended fan, just accept that it has foibles.

This fan is lightweight and really easy to use. It switches from battery to electric easily. Nice cooling! A good value!

. That's correct: the 02Cool is an excellent fit for a DIY 5 gallon air conditioner WITHOUT any modification to the top of the bucket or Styrofoam bucket liner. While our first purchase of the 02Cool was two units in 2011 (which are still in emergency operational use), this review also covers comparisons with the newer model recently purchased. The newer version has a 2018 manufacture date on it. The PLUSES are: 1. Both the older and newer (2018) model have very low wattage use when on either low or high setting (about 14/19 watts power draw respectively). This negligible use of watts is excellent when the fans are connect to an emergency backup battery source like the Goal Zero units (more on that latter): 2. The newer model seems more monolithic in build and seems to use lighter weight materials; 3. It is easier to open the new model base, where in the old model it could be difficult and frustrating unless you used the correct opening technique; 4. While the newer model is more quieter, it seems to produce less forced air when on higher setting (especially at greater distances from the fan). The simple solution is to place the fan closer to the person. NEGATIVE--Only applies to the Newer Model (2018): 1. The only significant negative is that the manufacturer REMOVED the convenient REAL HOOK where the fan operator could use the hook to hang the fan on a rope or bar. What is on the newer model is more like a 90 degree handhold. For both models, if one has planned resources for "when the lights go out" because of any critical incident, then it makes complete survival sense to use these fans because: 1) Battery operated; 2) Low Wattage (for use with batteries, and backup battery sources such as homemade units or the Goal Zero units), and 3) Portability (including use on top of the DIY 5 gallon bucket you built to cool down those that God placed in your stewardship such as the aged and the infirmed. While it is best to have your own lower wattage deep freezer and backup battery power to make and store your own ice, note that at least during the recover period during a critical incident FEMA and/or your local state emergency management operations usually provide ice to residents. Save those food grade tough plastic bottles so you can repeatedly refreeze the water in those bottle to use in your DIY 5 Gallon Air Conditioner. Lastly, the O2Cool fan can be laid flat on top of your DIY 5 Gallon Air Conditioner without having to cut the top lid of the bucket or the Styrofoam bucket liner that prolongs the life the ice. For the internet video search DIY 5 Gallon bucket air conditioner and look for the orange bucket in the image. Stay Safe, ...GhillieMan (aka, Chappy)

Let's talk about hurricanes. Last year, Irma knocked out my electricity for 6 days. It was September in sweltering Florida. No ice. No electricity. No cool air. I had bought an O2Cool fan YEARS ago (it was really cheap then $7,99) for camping. I dragged it down out of the closet and it saved my life! Seriously, saved my life. O2Cool is a great brand and that old fan works SO good. It kept me alive and cool till my electricity came back on. It takes 8 D batteries, so make sure you are stocked up. Hurricane season just started again. I bought this updated O2Cool fan (it's a little different than my old one - lighter weight, but otherwise pretty-much the same. I haven't used it yet because I haven't needed to. But, I tested it out and it works great. I put it back in the box and will hopefully never have to use it. This one came with an A/C cord (my old one didn't), so that's good for when I do have electricity. The fan would be great for camping or a picnic. It's super lightweight and is slim and would travel well. It has 2 speeds - low and high. This is a great little fan. The price $26 was a little high, I thought, but I don't care. When you are sweating to death in Florida with no electricity, the fan is worth it's weight in gold! All good. Highly recommend!

Mine came with a cord, so I don't know how well it holds up on batteries, but it wasn't the sturdiest of cords, so I fully expected to eventually migrate to batteries before I --- -tripped over it on the floor and broke it beyond repair (or, more optimistically, "became usable parts"). That said, it has a pretty good design in its capacity to fold. Will tip if you don't have the weight of batteries in the base. Might be good for travel as it is light, just protect it when you pack it. It is quiet, although the amount of air moved seems pretty proportional to the lack of noise. I've since bought two Vorados, and woweee, noisy, but also moving some serious air. This fan would be more ideal for a hotel room or a 10x10 bedroom. Enough noise for white noise, probably, but you won't mistake it for a jet taking off. The fan took a little bit of abuse before its death knell - fell several times and got squished a few different directions. Two or three weeks of use before my leg got tangled when I was trying to squeeze in behind my fridge and squarely landed a size nine foot on it, which it did not like. Was a little dismayed to see fine gauge electric wire handling the juice. I'd expected something a bit heavier, but as noted above, the wire on the AC plug was super fine, too, so expected? For the price, I suppose that's about right. I see similar fans going for $30+ at other sites for other brands. If I'd paid that much and it broke that easily, I'd be miffed, but it was a quick fix for a temporary situation and hopefully I can reuse some of the parts in other projects, so it won't be a total loss. If I were the manufacturer, I'd probably complement my product line by making a higher output, more industrial version of this fan. The overall design is pretty smart, using deep pitch on the blades makes a big difference, and there's potential to make it more of a "forever fan" with just a few mods. For this price (<$20), you're probably getting a pretty good deal.

I have had this fan for years already and I just needed a new one and this works just as well as the others do, but I find that you normally have to use it on the high speed to be very comfortable, but I highly recommend this battery operated fan, and make sure the batteries are all in very good condition. If one is a little bit low it will hinder the fan from working properly, or even make it look like the fan doesn’t work.

This is one of the best portable fans I have had. It simply is amazing and meets its puprpose and is a wonderful traveling fan. The best part is I orderd and got it shipped from US with in week inspite me being in Cochin where normal couriers take ages. I wanted this to be taken with me on my tour to Europe where we are doing quite a bit of home stays in the country side where most homes don't have A/C or fan and in recent years European summers have become hot (temp in Spain was 39 degrees) and i have had bad experiences in the past as well, hence we decided to take a fan. Straight away knew the cheap Chinese fans (already having extremely poor reviews on amazon) would not be enough. After a long search finally found the O2-Cool series of fans. Not only it proved to be extremely useful it was also super light weight and did not add on to our overall weight limit in a bad way. Special mention of the company Ganapathy Global who sold it cheaper then many other sellers but also promptly responded to my email request for delivery within a week as I needed it for my travel and it came ahead of the time they promised. Please note: This product is for travel or to be used in close proximity and recommend using a light weight extension cable than buying the heavy and expensive rechargeable battery's (unless you are camping).

El aparato perfecto cuando deja la luz

Update 21Jun23 -- incredible machine, still going strong all seasons. Battery tip, since Amazon jacked their's so high in price, tried Dollarama's Panasonics, equal to the task and significantly cheaper. Update 14May22 D Size Adapter -- decided to return the adapters (noted below). Only got average four-to-six hours out of the AAs with adapters -- not worth the light weight and hassle changing so often. Get minimum 20 hours with Amazon gold D batteries, gone back to them. Update 25Apr22 -- Holy smokes, still going strong and definitely the best investment ever. Works fabulously with both AC and D Batteries. Recently bought a D Size Adapter that takes one AA battery and it also works great and is just a bit lighter-weight, although don't last as long as Amazon Basics gold D cells but alternative when you run out. (https://www.amazon.ca/gp/product/B076Q6SQM4/ref=ox_sc_saved_title_1?smid=A3P4UZIS42PRQV&psc=1). Now heading into warm weather and after working great through winter to help circulating heat it's now keeping me cool again. BTW, did buy a skinny paint brush to reach through grill to remove gunk from blades. After "brushing", tip and tap on the ground to dispose the gunk. Update 11Mar21 -- This is one of the best purchases I have ever made! It's still working VERY well with both AC and batteries in both cold (circulating heat from my camper van propane Mr. Heater) and hot weather to keep me cool. I can't imagine not having it. I have, however, found one thing that frustrates: it's solid one-piece plastic housing cannot be opened to clean the blades which are very, very dusty after more than two years of pretty much constant use. I've taken to using a 2-inch hair-rather-than-synthetic paint brush to try to clear the outer housing rings as much as possible. Might next try a skinny artist's brush to reach through the rings to the blades. Update 03Jul20 -- amazing device! Working really well still with both AC and batteries. Used all winter to help move the heat around from my propane Mr. Heater, and now the weather is getting hot and humid again so am using it to keep cool. Again, this size is so much better than a 5 or 6 inch fan in a camper. Really, it's absolutely worth the cost. Update 22Oct19 -- still working fantastically! Using it now to help heat flow around the space. One of my best purchases! Original Review 2018 With both power and battery capacity, this is a really good fan. With batteries installed, when you plug in power supply it auto-switches to AC and doesn't run down the batteries. Am using in a camper van, and when I have power it's "FANtastic", and when on batteries it still has very good power. So glad I got this instead of a 5 or 6 inch battery-operated fan; the large 10 inch size gives much more air circulation. The batteries work for around 5-6 days on low running it for 4-6 hours per day. I've found turning off for a couple of hours seems to restore the batteries so they run strong again for at least a half hour before slowing down again. Another thing I noticed is that when I do use on AC power, that also seems to restore the batteries and they run again really well -- don't understand that, but it's a bonus for me.

very good fan for personal use. it has got battery box inside. so it will help you to keep cool during the power cuts.

Es práctico para uso corto , culo una oficina oh cuarto pequeño no es muy ruidoso.