LEIGAO Comfortable and Portable: No more traditional cold metal warmers feeling like holding a stone With thousands of polished surfaces smooth and warm The curvy body and pocket size design fit your hands betterMultiple Uses: This portable USB heater can be used as a power bank to charge your mobile phones anytime and anywhere You can use it to keep warm at home or office longtime traveling and various outdoor activities like hiking climbing fishing and so onDouble-sided and Three-level Heating: Press the switch then both sides of the hand warmer quickly heat up Release warmth and quickly dispel the cold The hand warmer has 3 constant temperature levels for you to choose: low temperature 35C medium temperature 45C and high temperature 55C The high-quality chips are built to control the thermal balance fully charge or automatically power off at over high temperatureLong-lasting Heating: The rechargeable hand warmer offers much longer battery life built-in 5200mAH Battery and maximum energy Super hand heater can provide up to 4-8 hours of warming timeWinter Gift: Ideal gift for an anniversary wedding ceremony birthday party or Thanksgiving Day Christmas This hand warmer is perfect for winter