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 one 2. 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 winter 3. Keep Dry: Dust plug protection, keep dry and clean at all times, charge safely and take care of safely 4. Small Stature: Small figure, portable when going out, mini figure, you can get into bags and pockets at any time 5. Rational Design: 3 seconds double sided fast heating, reasonable temperature level design, take care of your every need Specification: Item Type: Portable Hand Warmer Material: ABS, PC Function: It Can Be Used As a Warm Hand Treasure or a Charging Treasure Product 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: 10000mAh Maximum Heating Time: More than 8 hours Heating 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 Manual Note: 1.Please allow 0 to 2 cm error due to manual measurement. Thanks for your understanding.2. Shipped with Built In Battery