I've used these for travel in tropical areas outside of the U.S. and they never fail to draw a crowd. They work really well and stay charged for a lot of time. The bad part is that I've ended up gifting several pairs to people who needed it because they liked them/needed them badly. I've given a pair to an elderly archeologist who struggled to keep up with teaching his students in the heat of Africa (in fact, the director of the program decided that these were a fieldwork necessity and ordered a bunch for his entire section), a pregnant woman who had some health issues and lived in a house without A/C, and other worthy people - but that means I have to keep buying them for myself. The only bad thing about them is any long hair can easily get stuck and it's not fun, so make sure your long hair (or maybe beards?) are carefully tucked away. Oh, and the lights drain the battery much more quickly but without the lights on they last a full working day, if not longer. You can also charge them with the same battery packs you charge your phone with. One other bonus, they keep pesky bugs off your face and neck - great for places with flies who think that eyeballs are fun to eat.