Power bank:2500 mah Charging via AC adaptor or USB Can be power bank for mobile phone Can be hand warmer at the same time 2500 mah power bank and hand warmer.Built-in rechargable lithium battery.Power bank for I Phone, HTC,NOKIA, charging via USBThis reusable hand warmer gives smooth warm effect to rheumatic conditions of joints as well as pain caused by abdomen, stomach,waist,leg,shoulder, neck ...