Iphone 4/4s external rechargeable battery case, new ?

Hi, for sale is an external battery charging case for iphone 4/4s. -If you have a low battery just switch the case on and it will charge your battery for you whilst you are out. specs- iPhone 4/4s External battery Detail: Petite, convenient, easy to use, high capacity Compatible with iPhone4 Use USB cable to charge power 4 LED power indicators Output V: DC 5V Output C: ≤700mA（0.7A） Input V: 5V Input C: ≤1000mA（1A） Contain: 7WH（1900mAh） Charging time: 4 to 6hs Size: 126 x 63 x 15mm Weight: 66.5g Standby time: >380hs Call time: over 6.5hs at 3G Surfing time: over 6.5hs at 3G/over 7hs at Wi-Fi Music playing: over 28hs Video playing: Over 8hs call, email or text.