Features: 1. Convenient: : No need AC power, use 1PC AA battery for charging 2. It supply the power to the mobile phone by the AA battery inside until the AA battery is used up. 3. High efficiency: It gives your mobile phone up to 90 minutes talk time or 24 hours standby time. (Depend on battery quality) 4. Compatible: By equipping different connectors, it is fully compatible with various cellphone/MP3, etc. 5. Portable: Small size (just a little bigger than AA battery) 6. Safe: Over voltage protection for the circuit and your mobile phone 7. When a rechargeable battery ( Ni-MH or Ni-CD) in it, it can be recharged by PC USB port with USB charge cable. 8. Size: 21x86mm Cell: AA size dry battery or rechargeable battery. Warning: Please take out the battery if you won't use it for long time. Accessories: Output cable, USB charge cable, adapters Packing: Each into a blister and paper card. 40PCS/CTN Meas: 39.5*47.5*38cm G. W: 6.5kgs