USB hand warmer

1. 1100mA built-in lithium-ion battery, working time about 3 hours
2. 3 temperature mode selection: High, low, sleep(massage)
3. Prolonged use of vibrating massage function can be reduced hand fatigue.
4. Red, yellow, orange, indicate light.
5. Electronic chip automatic control, to prevent  temperature excessive rise.
6. Small in size and ideal to put into your pocket.
7. It is convenient at commuting, going to school, and the sports leisure.
8. 2 side heat