ThermaCELL Pocket Warmer, big brother of the Hand Warmer, is a battery-operated warmer that can be used to bring the heat to your pocket, jacket, pants or hand muffs. Charge your Pocket Warmer between uses to keep it ready for the next time you need to conquer the cold. Package contains: 1 Pocket Warmer equipped with an integrated rechargeable lithium-ion polymer battery, 1 USB wall charger, 1 USB cord and an instruction booklet. Features: Charges in 4 hours or less. Thin and lightweight. Easily turn off at the touch of a button. Three temperature settings reaching up to 116°F. Recharges hundreds of times. Shock-resistant. Lasts up to 6 hours of constant heat per charge. Water-resistant.