<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