Rechargeable and reusable hand warmer: The electric hand warmer is a reliable way to warm your hands. It is equipped with a USB cable, you can charge it anywhere. Compared to the old hot water bottle, the electric hand warmer is more comfortable and durable. .10000mAh large capacity battery: Built-in 10000mAh super large capacity battery, providing 7-14 hours of continuous use with 3-4 hours charging. This will be your perfect assistant to protect yourself from the cold. .3 Seconds Fast Heat-up --- Just press the switch and release the heat to you instantly in 3 seconds and warm your hands continuously for several hours. 3 temperature levels 40 50 60 selectable as required. .Multifunctional hand warmer: is not just a hand warmer. It could be a power bank that can charge your phone and other devices. And it could also be an emergency lamp and massage. .Safe and perfect gift: together with multiple protection technologies to protect your devices from over-voltage, over-charge, over-current and short-circuit. It is exquisitely crafted and comes with an exquisite packaging box. It is a perfect gift for family and friends in winter. .