DOUBLE-SIDE HEATING FAST WARMING: The double-sided heating design protects your hands from frost damage at any degree. When you turn on this USB hand warmer you will be surprised to find that the hand warmer starts to heat up quickly providing you with warmth continuously. _ POWER BANK: 10000mAh large capacity charging time for power bank only needs 3-4hrs with the 5V/2A high speed transmission. Provides reliable replacement power as soon as your phone battery runs out. _ FRIENDLY TEXTURE: Cute little hand warmer is made of aluminum alloy and ABS material after tens of thousands of polishing to create a unique matte skin-friendly touch the ergonomic anti-slip design that fits perfectly with your hand warming curve. _ EXTENSIVE USE: Perfect for all kinds of outdoor activities like racing fishing hiking skiing motorcycling hunting climbing running sledding etc. Cute warmer is the perfect gift for sports enthusiasts enjoy outdoor sports even in a harsh winter.