Input voltage: DC5V. Input current: 1A. Output Current: 750mA. Transmit Power: 5W. Charging voltage: 5V. Transmission distance: 5mm. Charging efficiency: 70%. Step 1: Open the back cover of Samsung Galaxy S5; Step 2: Stick the receiver card to the mobile phone's battery and the protuberant touch points must touch the recesses next to the battery; Step 3: Close the back cover; Step 4: Place the mobile phone onto the Qi wireless charging pad (the phone and the Qi wireless charging pad are not included). Note: The receiver needs to work with the Qi wireless charging pad.