Feature:1. 8 Seconds Fast Heating: 8 seconds fast heating, three level temperature control, different temperatures, different warmth. Dual purpose design, charging treasure, hand warming treasure in one2. 2 in 1 Design: Charging and hand warming are two in one, comfortable and full of energy. It is not only a hand warming treasure, but also a mobile fast charging. In addition to hand warming in winter3. Keep Dry: Dust plug protection, keep dry and clean at all times, charge safely and take care of safely4. Small Stature: Small figure, portable when going out, mini figure, you can get into bags and pockets at any time5. Rational Design: 3 seconds double sided fast heating, reasonable temperature level design, take care of your every needSpecification:Item Type: Portable Hand WarmerMaterial: ABS, PCFunction: It Can Be Used As a Warm Hand Treasure or a Charging TreasureProduct Size: Approx. 12.4cm x 7.5cm x 3.7cm / 4.9 x 3 x 1.5in(Manual Measurement, Slight Error May Exist)Battery Type: Lithium Battery (Shipped with Built In Battery)Battery Capacity: 10000mAhMaximum Heating Time: More than 8 hoursHeating Temperature:High Temperature: 53 (Use for About 8 Hours)Medium Temperature: 48(About 13 Hours)Low Temperature: 43 (About 15 Hours).Package List:1 x Portable Hand Warmer1 x USB Cable1 x User ManualNote:1.Please allow 0 to 2 cm error due to manual measurement. Thanks for your understanding.2. Shipped with Built In Battery