This desk top unit by #Toplanet is more like a fan NOT a portable ac unit. It does run on a rechargeable 2000 mAh lithium-ion battery. If you were looking for something to cool even a small room you'll be sadly disappointed. It does use some water or ice to make it cooler than an average fan but for extremely small spaces. More like for a desk or for cooling oneself while in bed on a night table. It would even be good for outdoors while at the beach or at a table outdoors while sitting with family and friends to help keep you cool. That said to be advertised as a portable a/c unit is a bit misleading. This will NOT even cool a small bathroom. It does have 3 speeds which is helpful if trying to go to sleep in a hot room and you want some wind in your face that is cooler than a typical fan. It's also great for working at a desk and keeping a bit cooler. At $39.99 this is what it is and is worth this price. It does have some cute color changing LED lights to add to its value especially if sitting outdoors or looking for a nightlight inside. I wouldn't pay much more then the $39.99 asking price as it's certainly not worth any more than that. Makes a great gift for a host/hostess for those outdoor backyard summer barbecues while sitting at a table.