Portable 4400mah Rechargeable Hand Warmer with USB Pack with Flashlight (Silver) 3-in-1 Product with Convenient Features of a Hand Warmer, External Battery Charger, and Emergency Flashlight Two temperature settings:107F (approx. 5 hrs) and 116F (approx. 4 hrs) when in room temperature. Intelligent temperature control to avoid overheating or burns Charges digital products, including mobile phones, MP3 players, digital cameras, etc. Rechargeable 4500mAh lithium-ion battery with up to 500 recharges Dimension: 3.5 * 2.3 * 0.94 inches; Charges via either USB or AC adapter (AC110-250V/ 50- 60Hz). Female USB cable to charge other devices in connection with your device's USB charging cable