O2COOL Treva 10 Inch Smart Power Fan With Built In Rechargeable Batteries and USB Port For Cell Phone Charging

Es muy práctico, dura bastante la carga

I bought 2 of these for daughter in Guam. She just had a baby and my wife went to help with the first month or so. They were experiencing power outages on a routine basis and my wife feared of being in a sweltering house without Air Conditioning for an extended outage. To provide some potential relief, I sent 2 of these, just in case.While my wife was there, she normally used one fan in her bedroom (plugged in) at night. When they did indeed have a power hit, my daughter, wife and grandkids were nice and cool in front of good sized battery powered fans. The fan has internal rechargeable batteries that charge when plugged in, as well as a bay for C-cell batteries for extended DC use. Normally the power outages lasted less than an hour but several times lasted between 2 and 3 hours and the internal batteries kept the fan running the entire time.From an airflow perspective, High speed was not as high as some room fans, and when in DC/Battery mode it is like a low setting, which is most certainly why it lasts so long. When using the C-cell batteries, it will be much stronger (medium high) and will last well over 8 hours at low speed.Very good choice if you need a good sized room fan with potential to provide battery powered cooling when needed.

I use it them to run in the car when I have to run in the store. I put one fan in each of the two back windows and roll it up to hold it in place. It means I can keep the dogs in the car with the windows open about 12 inches on each side and have two fans running... I also throw some extra ice into the Newt's cup that I keep in the front seat's center cup holder, but I sort of do that regularly anyway... but this is about the fans in the windows... this way if I have to be inside for a whole 10 minutes I don't wonder if I'll come back to dead dogs. They not only aren't dead, but they are quick to tell me they were bored... I also had to leave two of the dogs in a portable pen on the grass by the car one day for almost an hour... I set the fan right outside the pen blowing by the sheet I had set for them to rest on, and when we came back the fan was still blowing! So I used it on the picnic table where the food was set up at a BBQ to help keep bugs off the potato salad. Since the potato salad was all gone in about 15 minutes it was fine. Which was great. I have not tried it with batteries yet, because the charging function is working fine.

Nice product. This fan puts out a lot of air considering the small size. You can put It on either the low or high setting. It is best to use it on the low setting if you want to preserve the battery. There are three power modes which include an electric power adapter, included rechareable battery and the option to use standard house hold batteries. It is relatively light and portable but adding standard batteries does increase the weight. I purchased this so that I will be able to use my fan in the event the power goes out. That's the benefit of the rechargeable batteries. I haven't experienced any problems with the rechargeable batteries that the other reviewer's posted (not working long). I do run the fan periodically to prolong the battery life. I would highly recommend this product to others.Pros- arrived quickly- Portable and powerful air source for the size- It has three power mode options- Easy to assemble ( you only have to assemble the bottom feet)Cons- Putting standard batteries into the fan does increase the weight slightly

I got the previous model 02Cool 10" rechargeable fan in May 2010 and it is still going strong after 5+ years. It's been a real life saver (or at least: a heat stroke saver) for me over the years. I decided to get the new model recently because I wouldn't want to be without one even for a day if the old one dies out or won't hold a charge anymore after 5 years of regular use during the warm months of the year. Also, even though the fan will run 3 hours or so on a full charge, it's nice to have a second one for the rare times I need more than 3 hours or if I want to share the air.I am surprised that the old model is still being sold by Amazon when it costs $10 more and has fewer features than this one. The best feature is the new design of the power switch. The old one would sometimes rub up against something when tossed in the back of the SUV which would turn on the fan and run down the battery. This one has the off position better located and doesn't appear to accidentally turn on as easily.I also like the extra stability provided by the the legs, yet they can be quickly removed when I want to hang it by the handle.

If I could give this fan a zero star, or even a negative star review, I would do just that! We bought this for our converted van for traveling last August. After about a month or two of using it, when on high, it would speed up and slow down... Not actually staying at a high speed from time to time. I have tried charging it fully before using it, leaving it plugged in and everything but it only continued to do this more and more over time. We didn't use it much because we spent most of our time in mild weather. We tried to use it last night for the first time since winter and it stopped working completely. Too late to return it and I naively thought maybe I just had a "bad apple", I opted to purchase another one at Target in case I needed to return it quickly. Turns out that is exactly what I had to do. Had fan #2 for less than ONE WEEK before it went out!! I will never, ever buy another product from this company again... What awful, cheap, worthless products these fans turned out to be!