Specifications:Wireless Standard: QiInput Voltage/CurrenT: DC5V/1500mAFrequency: 100 to 200 KHzCharging Distance: 4-10 mmCharging Method: One-to-oneDiameter: 6.8cm/2.68'' (Approx.)Thickness: 1.1cm/0.43'' (Approx.)Energy Conversion: 76%