[UPGRADE LARGE CAPACITY]: hand warmers rechargeable can be charged with a USB A/C charging cable, and the 12w fast charging speed can be fully charged in 3-4 hours, providing up to 8-15H of lasting heating in the cold winter. The large capacity of 10,000 mAh can be used as a power bank supply to provide fast charging for your device, which is a perfect backup battery. [ MULTIFUNCTIONAL HAND WARMERS]: This hand warmers rechargeable With 7 colors of colored lights, can also be used as a power bank to charge mobile phones. Distinctive colorful hand warmers. [DOUBLE-SIDED HEATING 3 LEVELS]: heating design : This hot hand warmers heats up in one second on both sides. 3 levels of temperature can be adjusted at will, [104 (40)], [122 (50)],140 (60)], 3 levels of temperature, one key switch. [PORTABLE COMFORTABLE]: Using high-tech aviation-grade aluminum material, fire-resistant ABS material + PC material, after multiple polishing, to create the extremely simple pocket size and ergonomic curved edge design, the texture is soft and non-slip, easy to grasp the warmth of winter with your hand. [WARMING WINTER GIFTS]: With handwritten greeting cards is suitable for family, friends, girls/boys, man/women, the elderly as holiday gifts for Christmas, Halloween, and Thanksgiving. It is also suitable for outdoor sports enthusiasts and the hyperthermia needs of patients with arthritis. Delivery quantity: 1pcs Product colour: black Product size: 135*85*50MM