http://www.maxbodydev.com/blaux-portable-ac-reviews/

new air cooler uses a small, rechargeable lithium battery. Using a USB cable, you can easily charge the AC battery the same way you do a smartphone. This can prolong the battery life, making the AC function even in the absence of power. Additionally, the blaux portable ac embraces thermoelectric cooling principle, which delivers a cooling effect whenever it’s on. With DC electric current on one side of the plate and AC electric current on the other, the heated side remains in room temperature while the AC