The HeatBank® 9s Plus Rechargeable Hand Warmer with curved, ergonomic design and digital display 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. Also features dual charging ports so you can charge 2 compatible USB devices (cables not included), intuitive controls and integrated LED flashlight. Includes: rechargeable 5,200 mAh lithium-ion battery, adjustable neck lanyard and USB charging cable. Colored battery and heat digital display quickly shows the selected heat settings and battery charge remaining. This product does not use any fuel or burners.