Hugchg&reg; New Design Ultra Thin Wireless Charging Receiver Module for Samsung Galaxy S4 Special deigns for Samsung Galaxy S4. Ultra thin design, compact and light weight without increasing additional weight Can be attached to the battery all the time, and it would not interrupt the normal use of the Samsung Galaxy Just simply put your phone on the charging pad and your phone is ready for wirelessly charging Simply stick the Receiver Pad to the battery, and you are ready to charge the device wirelessly by placing on the Wireless Charging Dock (Wireless Charging Dock is not included) You don't feel any extra weight when installed the Receiver Pad to the battery in your device