Features 1. SAFE AND CONVENIENT: Made of high-tech aircraft aluminum and ABS material, anti-burn, explosion-proof. This mini hand warmer has a built-in intelligent protection system that provides protection against power on, short circuit and overload. 2. POWER BANK 2-in-1 HAND WARMER: This hand warmer really helps warm up your cold hands and gets the circulation going, perfect for relieving aches and pains. Best gifts for friends and family during the cold winter. 3. FAST WARM HANDS 3 LEVELS: Press the power switch and instantly release the heat for you. Heat up double sides quickly in seconds. Three temperature levels: Low: 104F, Medium: 122F, High: 140F of your choice. 4. LARGE BATTERY CAPACITY: 5200mAh capacity can provide a full charge to common digital devices on the market, the blue light shows how much charge is left. 5. POCKET SIZE: Small and light. Handy to carry everywhere in your pocket or bag when you do sports, fishing, hiking, camping, skiing. Specification Material: Aluminum alloy, ABS Color: Blue, Silver Size: 10.2 x 5.8 x 2.3 cm Weight: 150 g Battery capacity: 5200 mAh Input / Output: 5V 1.5A Package Contains: 2 x Hand Warmer 2 x USB - cable 2 x User manual