1.keep your hand warm 2.Charge your mobile,MP3/4,smart phone,PSP,PC, etc. 3.Build-in 4400 MAH Lithium rechargeable battery. 1. With 4400MAH internal Lithium –ion rechargeable battery, could be recharged up to 500 times.2. Use PET as the heating material3. Two functions: warm your hand and charge MP3/4/5 and charge kinds of digital products, such as mobile phone, camera, Ipad, Iphone, PSP, etc. 4. ...