Veeki Qi Standard Wireless Charging Receiver Module for Samsung Galaxy Note 2 / N7100 (Black) the receiving coil attached to the phone battery, two the contacts aligned cell phone reserved the two contacts coil installed, cover the back cover of the phone is placed in the charger area can give the phone Oki Method of charging rechargeable machine rechargeable machines with QI flag placed in the charging area placed in to the charging area after charging, mobile charging machines (in order to machine identification) AC/DC adapter input: 100-240v 50/60hzCompatibility: SamsunInput: self-adaptationg Galaxy S4 S IV i9500