The HeatBank® 9s Rechargeable Hand Warmer with curved, ergonomic design keeps you warm with the press of a button for up to 9 hours. Dual sided heat up to 120° F with six heat settings for adjustable and comfortable warmth. Includes: rechargeable 5,200 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.