【Multi-functional & Portable】: The large capacity hand warmer can also be used as a Power Bank and Flashlight. Besides, the palm size can be easily put into the pocket and carry around. Suitable for indoor working, and outdoor activities such as camping, skiing, fishing, mountaineering, traveling and dog walking in winter.【10,000mah Large Capacity & Double-sided Rapid Heating】: New upgraded 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. Within 3 seconds, both sides will heat up quickly and bring you warmth instantly. It provides all-round warmth for your hands, indoors and out, day and night.【Safety & Environmental】: The heater is made of high-tech aluminum alloy and ABS material, with multiple protection technology to prevent over-voltage, over-charge, over-current, over-charge, over-discharge, overheating, short circuit and explosion-proof, enjoy the warmth safely and comfortably.【2-year After-sales Guarantee】: We provide a 2-year super long warranty. If you have any problem with the reusable hand warmers, please feel free to contact us. We will take all measures to solve your problem as soon as possible to ensure your satisfaction.【The Best Gift for Family and Friends】: Hand warmers designed with exquisite packaging are the best gifts for lover, family and friends on Christmas, Halloween, Thanksgiving, New Year's, birthday, etc., bringing warm wishes.