Wireless Charger,Wireless Charging Receiver Module ,SOAIY All Qi-enabled Cell Phones Compatiable Charging Pad + Receiver Coil for Samsung S4 This Receiver Module Is Incredibly Thin Enough And Make Sure That It Can Give The Samsung Galaxy S4 Wireless Charging Capability. The Wireless Charger Can Work With All QI Enabled Devices If You Use Without The Receiver. Easy To Use: Take Off The Back Cover, Match The Receivers Points Exactly On The Battery, Put On The Back Cover. Place Your Phone On The Wireless Charger, Make Sure That Your Smartphone's Receiver Is Aligned With The Charging Area. When The Phone Is Charging, The Blue LED Indicator Light Will Blink Softly Automatically Input :5V/2A, Output:5V/1A, Efficiency:&gt;72%, Transmission Distance: 5mm (Do Not Need To Take Off Your Cell Phone Case If It is Under 5mm When Charging) Three Protection Systems :Over-heat Protection , Over Voltage Protection ,Over-load Protection . That Means Your Phone Will Not Be Over-heat , and Over Charged .Anti-Slip Pads and Small Light-weight Design, You Can Bring It Anywhere. The Rubber Ring Keeps Your Phone in Place When Charging