How to Use: Before installing, pull the top of the case upwards and put the phone on to it. Slide your phone into the backup battery cover and make sure that your phone is well connected to the male micro USB dock connector on the power bank case. Press the ON/OFF switch for long time (3-5 seconds) to activate (or to stop) charging, and confirm the charging signal on your phone. Press the ON/OFF button once to check how many battery capacities are left. (1LED:=25%, 2LED:=50%, 3LED:=75%, 4LED: =100%) Use your original charging cable to charge this battery case. Compatible: Samsung Galaxy S4 SIV i9500(Also compatible with i9505 i9508) Compatible with different versions of Galaxy S4 (Size: 5.38"X2.74"X0.31") Notice: Ultra-thin and Light-weight The capacity is 2200mah. It"s not possible to make it a larger capacity at such a thickness. Samsung galaxy s4 is NOT included.NOTE: IMAGE® is registered trademark of Imagestore US Inc and is exclusively distributed by BrainyTrade on Amazon. IMAGE trademark is protected by US Trademark Law.