Feature: 1. Two Levels Adjusted: Two levels of temperature can be adjusted, humanized design, switching warm at will, meeting a variety of needs 2. Many Functions: Not only a warm hand treasure, but also a charging treasure. It is a mobile phone energy supply station. Although it is small, it can save your mobile phone with emergency power 3. Comfortable Grip: In line with the human hand holding habit, the grip feeling is more comfortable. The design is larger than the girl's palm, and even the fingertips can be warm 4. Small Volume: Small figure, portable when going out, mini figure, you can get into bags and pockets at any time 5. Safe Use: Safety chip, explosion proof protection, the use of high quality chip makes people feel more at ease Specification: Item Type: Portable Hand Warmer Material: ABS , Silica Gel , Aluminum Alloy Function: It is a Warm Hand Treasure and a Charging Treasure Battery Type: Lithium Battery (Shipped with Built In Battery) Battery Capacity: 6000mAh Heating Time: 4-8 Hours Low Level: 47-52℃ High Level: 55-60℃ Size: Approx. 8 x 12.6cm / 3.1 x 5in. Package List: 1 x Portable Hand Warmer1 x USB Cable1 x User Manual Note: 1.Shipped with Built In Battery2.Please allow 0 to 2 cm error due to manual measurement. Thanks for your understanding