ThermaCELL Hand Warmers 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. Charge your Hand Warmers between uses to keep it ready for the next time you need to control the cold. Package contains: 2 Hand Warmers equipped with integrated rechargeable lithium-ion polymer batteries, 1 USB wall charger, 2 USB cords and an instruction booklet.