1、 Adopts premium ABS and aluminum alloy material, safe, sturdy and durable. 2、With exquisite workmanship, it has smooth and comfortable hand feel. 3、 Double-sided heating, it can last about 4 hours of heatness to keep your hands warm in cold winter. 4、 4000mAh large capacity, let you rest assured to use, also can be used as a cute mobile power bank for your mobile phone. 5、 Portable to carry, suitable for using in classroom, office, library, tea house, home, etc. 6、 It's safety and explosion protection, overvoltage protection, overcharge protection, short-circuit protection, overtemperature protection, overdischarge protection, overpower protection function, etc. 7、 TYPE-C two-way interface, support for both sides of the front and back, more convenient when used. 1 x Hand Warmer1 x Instruction Manual1 x Charging Cable Condition: 100% Brand NewItem Type: Hand WarmerMaterial: ABS + Aluminum AlloyColor: WhiteWeight: Approx.237g/ 8.4ozBattery Capacity: 4000mAhInput: 5 V - 2 AOutput: 5 V - 2 AHeating Power: 7-10WHeating Temperature: 50°C-60°C adjustable