The HeatBank® 3 Rechargeable Hand Warmer keeps you warm with the press of a button for up to 3 hours. It provides continuous gentle warmth on both sides with 2 heat settings (low and high) up to 113° F. Includes: rechargeable 2,600 mAh lithium-ion battery and USB charging cable. Indicator lights quickly shows the selected heat settings and battery charge remaining. Also has a 5V1A USB charging port and a 5V1A micro USB port. The power bank can be used to recharge your USB compatible devices (cable not included). This product does not use any fuel or burners.