Lifesystems USB Rechargeable Hand Warmer & Power BankThe Lifesystems Rechargeable Hand Warmer provides up to six hours of heat from one charge and can also double up as a power bank via the included USB cable if needed. Heating up in just 10 seconds and with four heat settings, this hand warmer will keep your hands warm on the coldest of days with even heat distribution thanks to the dual heat plates. Features: Rechargeable hand warmer Provides up to six hours of heat from one charge Charges from flat