Review on O2COOL Rechargeable Necklace Fan Adjustable by Edward Freeland

I have been using O2COOL products for many years. I was impressed that most of their fans are very economical yet efficient enough to make the air useful. I've used a similar version of this fan that runs on 2xAA batteries for a long time and found it reliable. However, this one isn't as good for everything as it looks. The fan hums like crazy and makes a lot of noise. I also find the button a lot fiddlier compared to the old toggle. It's much easier to get stuck in a bag or something, and the fan will turn on when you're not using it, wasting energy or even damaging the motor (it's no good letting it run out of air if something is blocking the air intake blocked). . Overall it's a good idea and it works most of the time, but there are other options so for now I'd suggest bypassing this until you have more control over the quality.