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When you feel cold it's a rechargeable hand warmer. When your phone is low on battery, it can be used as a power bank. You can recharge your phone and warm your two hands while you work. Press the switch and instantly release the warmth for you. Rapidly warm up in 3 seconds. 3 levels of temperatures 95-107°F/104-118°F/118-131°F according to your needs. Our rechargeable hand warmer adopt with latest technical innovation, it can be full recharging in 3.5 hours. And it has charging ports on both sides, you can charge your phone and computer at the same time.