Whatever your outdoor activity, the HEATD Hand Muff will keep your hands toasty warm, even on the coldest of days. It uses Fuse Integrated Technology provides you with an edge-to-edge heated hand warmer, with no cold spots. Adjust the heat to one of three temperature settings, for your preferred heat level. The outer fabric is wind and water-resistant. The zipper pocket in the front is great for storing essentials, like your keys or phone. Adjustable strap offers you the perfect fit at the most comfortable size. The battery needs 1 hour of charging, and the Hand Warmer stays warm for 4 to 6 hours. The rechargeable battery has dual USB ports, so you can charge your smartphone as well! You can safely remove the heating pad and battery from the hand muff, and machine wash your hand warmer – staying warm never has to get stale! Wash on a gentle cycle for best results.