As hot digital accessories recently, mobile power supply has been paied so much attention to by more and more people ,  a variety of smart phones are so popular rencently, more and more people begain to buy a mobile power supply with  suitable power capacity to provide additional operation-time  for mobile phones and other devices. today we introduce the mobile power supply is made up of Full Metal Jacket  - "B-YOU" BY44AJ. The mobile power  not only gives  strong metallic finish, but also the nominal 4400mAh battery  capacity can meet the need of the majority of user .