Warms on both sides of the unit to keep hands toasty * Two temperature settings:109F (approx. 5 hrs) and 120F (approx. 4 hrs) when in room temperature. * Charges digital products, including mobile phones, MP3 players, digital cameras, etc. * Rechargeable 4400mAh lithium-ion battery with up to 500 recharges * Charges via either USB or AC adapter (AC110-250V/ 50- 60Hz)