Item Type: Electric Hand Warmer Material: PC, aluminum alloy Size: Approx. 112 x 60 x 24mm / 4.41 x 2.36 x 0.94in Built in Battery: Lithium battery, 5200mAh Heating Gear: 3 gears, 1st gear heating temperature 45?50, 2nd gear heating temperature 50?55, 3rd gear heating temperature 55?601Portable: Small size makes the hand warmer easier to put in your pocket, and the warmth helps relieve menstrual cramps, chapped skin and frostbite. 2Perfect Gift: The perfect gift for sports enthusiasts, such as climbing, hiking, traveling, camping, skiing, cycling, etc. 3Safe to Use: Use high quality chipsets to control heat levels, no liquids and flame retardant materials to ensure product safety. 4Convenient Storage: Give you a portable bag for free, and put it in the bag when the high temperature makes you feel hot to avoid burns. 5Fast Heating: Using PC and aluminum alloy material, smooth touch, double sided heating keeps your hands warm at all times. 63 Gear Adjustment: 1st Gear heating temperature 45?50, 2nd gear heating temperature 50?55, 3rd gear heating temperature 55?60, giving you more choices. 7Large Capacity Battery: Used as a mobile power source, built in 5200mAh lithium battery, which can fully charge digital devices, large capacity keeps warming hands for 4?8 hours, and recharges the phone 2?3 times. 1 x Hand warmer 1 x USB Cable 1 x Storage Bag