battery case for iphone 6/6s, 4500mah portable extended smart battery pack and protective charger case updated version (black) smiphee <b>improved material</b> <br> it is hard to break off the top part, which is made of rubber improved material. the charging case is soft and feels good in your hands.<br><br> <b>convenient charging</b> <br> the battery case keeps your all-day battery life. great add one for people who like to travel a lot.<br><br> <b>advanced sync-through technology</b> <br> support syncing data through computer and audio activities without removing the battery case.<br><br> <b>easy to use</b> <br> bend the top part and slip your phone into charger case, then press and hold the back power button for 3 seconds to turn on or turn off. 4 led indicators will show you how much power is left.<br><br><br> <b>specification:</b> <br> capacity: 4500mah<br> input: dc 5v/1a<br> output: dc 5v/1a<br> support simultaneously charge, phone charge first