4200mAh Power Bank External Battery Charger Case Cover for Samsung Galaxy Note 2 Use: Slide your SAMSUNG Galaxy Note II into the power case and make sure SAMSUNG Galaxy Note II is well connected to Mirco 5s pin dock on the power case. ON/OFF switch: press the on/off switch to activate or stop the charging, see the SAMSUNG Note II screen to identify the charging signal. Battery level: press on/off switch once to check how many juice left, see below indication. Charge: Simply plug in the USB turn micro USB to the micro USB female dock, connect the USB to a powered USB equipment or computer. Before installing and using the product, please read the instructions thoroughly, and retain them for future reference.