ThermaCELL Hand Warmers and their bigger brother the Pocket Warmer are small, battery-operated warmers that aren’t just for your hands. These durable packs can fit easily in pockets, jackets, pants and gloves for up to 6 hours of constant heat per charge. Thin and lightweight- both variations feature 3 temperature settings reaching up to 116 degrees F and are both water and shock resistant. They charge from dead to full in 4 hours or less and recharge hundreds of times. Charge between uses to keep it ready for the next time you need to conquer the cold. Pocket Warmer package: 1 Pocket Warmer equipped with an integrated rechargeable lithium-ion polymer battery, 1 USB wall charger, 1 USB cord and an instruction booklet.|Hand Warmer package: 2 Hand Warmers equipped with integrated rechargeable lithium-ion polymer batteries, 1 USB wall charger, 2 USB cords and an instruction booklet.