Input voltage: DC 5V. Transmitted power: 5W. Charging current: 500mA. Transmission distance: 5 mm. Charging efficiency: >70%. Execution standard: QI wireless charging standards. Dimensions: 4.17 in x 1.42 in x 0.04 in (10.6 cm x 3.6 cm x 0.1 cm) Weight: 0.18 oz (5 g)