Features: 1.4000mAh rechargeable lithium-ion battery, fully charged and can be heated continuously for 3-4 hours. 2. 360 hand warming experience, 5 seconds rapid heating, continuous heating for 3-4 hours, heating temperature can reach 58 3. With AUTO automatic gear, the hand warmer will automatically stop heating after 2 minutes of rest, and it will automatically heat when picked up. 4. The hand warmer has built-in NTC temperature control module, and the temperature remains as high as 58 in a relatively closed pocket environment, which is not hot. 5. Exquisite winter gifts for your family and friends, they like snow sports, winter travel and other cold outdoor activities. Specification: Name: Hand Warmer Size: about 13.2x4.8x4.8cm/5.20x1.89x1.89in Weight: about 152g Material: ABS+PU+ aluminum alloy Output (mobile power): for DC 5V 2A Output (heating power): 4-9W USB output and input: for DC 5V 1.8A Input interface: Micro-USB Lithium battery capacity: 4000mAh Maximum heat: 58 Packing List: 1x Hand Warmer 1x USB Charging Cable 1x Manual