The HeatBank® 6 Rechargeable Hand Warmer keeps you warm with the press of a button for up to 6 hours. It provides continuous gentle warmth on both sides with 3 heat settings (low, med, high) up to 120° F. Includes: rechargeable 4,400 mAh lithium-ion battery, adjustable neck lanyard and USB charging cable. Indicator lights quickly shows the selected heat settings and battery charge remaining. Also has a 5V2A USB charging port and a 5V2A 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.