ThermaCELL Heat Packs - Rechargeable Pocket Warmer w/USB Cord and Wall Charger Black. The smaller Hand Warmers come in packs of two that fit into gloves and small pockets to keep your hands at the right temperature. Also available in a larger size Pocket Warmers can't inside coats and jackets to keep entire areas of your body warm. Specifications for ThermaCELL Heat Pack - Pocket Warmer: Manufacturer: ThermaCELL Color: Black Features of ThermaCELL Heat Pack - Pocket Warmer: Internal LiPo battery fully charges in 4 hours or less and lasts hundreds of charging cycles 3 heat settings adjust warming levels with a simple touch of a button to maintain your desired temperature Get continual warming comfort up to 6 hours per charge Reusable Heat Packs can be used for years providing signi?cant savings when compared to disposable hand warmers Great shape retention and shock absorbency Package Contents: ThermaCELL Heat Pack - Pocket Warmer Rechargeable heat packs provide constant regulated warmth. Features an internal LiPo battery that fully charges in 4 hours and lasts over 500 charging cycles three heat settings and last up to 6 hours per charge. Comes with a USB charger with power cord. Measures 4 in. x 2.9 in. x .45 in. Rechargeable heat packs provide constant regulated warmth. Features an internal LiPo battery that fully charges in 4 hours and lasts over 500 charging cycles three heat settings and last up to 6 hours per charge. Comes with a USB charger with power cord. Measures 4 in. x 2.9 in. x .45 in.