LUXA2 Wireless Charging Receiver for Samsung Galaxy S4 - Retail Packaging - Black The wireless receiver is a simple peace of technology that allows energy transfer between a transmitter (wireless charging pad) and receiver (smartphone device with integrated or attached wireless The metal contact point is designed for attaching onto the wireless charging contact of your Samsung device, whilst the sticker is an adhesive strip designed to stick onto the back of the battery pack Step by Step Installation Guide