USB Hand Warmer/ usb heater / usb heating

USB Hand Warmer:Fast keep hand warmer at 45-55 degree,Portable USB hand warmer;Plug and play, 5V DC power supply from USB . USB Hand Warmer: (1)Unit size:2*2*7CM (2)Weight: 81g (3)Color:white (4)Material:metal Main Spec: (1) Portable USB hand warmer. (2) Plug and play, 5V DC power supply from USB without external power; (3)Fast keep hand warmer at 45-55°C; (4)Easy operation and keep your hand warm by USB during working time, also an excellent promotional gift;