JSG Accessories iPhone 4 4S 1900 MAH External Rechargeable Backup Battery Charger Case Cover for Apple iPhone 4 4S Black The case offers full body protection Led skyblue remaining battery indicator The black matte anti-slippery finish will also offer a great feel while being held in hand Sleek, low-profile design ; rechargeable up to 500 times - charges through usb cable Standby time: up to 230 hrs.;talk time: up to 5 hrs ;internet use: up to 5.5 hrs on 3g