Stay warm on a cold day or at least keep your phone charged with the 2-in-1 versatility of the ThermoCharge(TM) Power Pack and Hand Warmer. This rechargeable pack is capable of providing up to 6 hours of heat or charging multiple USB devices with its battery. Status LEDs let you know how it's being used and how much power is left. Never be without heat or power with the Celestron(R) Elements ThermoCharge(TM) Power Pack and Hand Warmer. FEATURES: Rechargeable power pack and hand warmer Provides up to 6 hours of heat at a time Charges most USB powered devices in less than 2 hours Durable with aluminum housing and protective silicon caps Ergonomic design for pockets and pouches Status LEDs for battery capacity, charging external device, and hand warmer function 4400 mAh lithium battery Recharges via USB 2.0 connection Contains Mini USB port and standard USB 2.0 port Includes USB charging cable and soft carry pouch Max temperature: 104degF to 113degF Dimensions: 1.76" x 3.72" x .9" Weight: 5.22 oz Model: 48012