Hand warmer with USB and Battery

Hand warmer with USB and Battery 1,The Hand warmer is designed with ergonomic, streamlined look for handheld use, you can put in pocket or hand use; 2, with a USB cable, USB cable connected to the computer can be used; usually can USB power with, as a battery charger (this feature optional, this offer does not contain this feature); 3, The battery is removable,the user can freely choose the battery (battery for the battery 5AA, the proposed high-capacity rechargeable battery 5), but also a back-up, truly continuous use; 4, stall set of three files, stalls for one LOW 10--25 degrees C, use of the environment, can reach 43 degrees (plus or minus 3 degrees C), HIGH stalls for 0 - 10 degrees C, use of the environment, but also can reach 43 degrees (positive negative 3 degrees C); 5, The machine is light weight, easy to carry, and to reduce transportation costs;