Features: 1. Multifunctional & Portable: The USB hand warmer can also be used as a Power Bank and Flashlight. Besides, the palm size can be easily put into the pocket and carried around. Suitable for indoor working, and outdoor activities such as camping, skiing, fishing, mountaineering, traveling and dog walking in winter. 2. 10,000mah Large Capacity: Premium 10,000mah large capacity hand warmers, durable warm protection can reach 6-12 hours, longer warm time, drive away the cold in winter. Hand warmers have 3 temperature modes (40, 50, 60). 3. Double-sided Fast Heating: Within 3 seconds, both sides will heat up quickly and bring you warmth instantly. It provides all-around warmth for your hands, indoors and out, day and night. 4. Safety & Environmental: The heater is made of high-tech aluminum alloy and ABS material, with multiple protection technologies to prevent over-voltage, over-charge, over-current, over-charge, over-discharge, overheating, short circuit and explosion-proof, enjoy the warmth safely and comfortably. 5. Warmth Gift: Hand warmers designed with exquisite packaging are the best gifts for lover, family and friends on Christmas, Halloween, Thanksgiving, New Year's, birthdays, etc. Show your love and care to them. Specification: Material: ABS + Aluminum Alloy Product Color: Black, Rose Gold, Blue, Grey Product Size: 110 x 63 x 33mm Product Weight: 185g Input/Output: 5V/1A Charging Time: About 4 Hours Battery: 10000mAh High Temperature Resistant Polymer Lithium Battery Temperature: Low Temperature: 40, Constant Temperature: 50, High Temperature: 60 Using Time: Low Temperature: About 12 Hours, Constant Temperature: About 7 Hours, High Temperature: About 6 Hours Package Included: 1 x Hand Warmer + 1 x Manual + 1 x Charging Cable + 1 x Gift Box + 1 x Cloth Bag