Input: 5V; Charging current: 850mA; Function: Charged by power supply with wireless emitter; Compatible with all Android devices with Micro USB; Usage: Built-in wireless receiving coil, which must use together with wireless charging emitter; Transmission distance: 5mm; Charging efficiency: >70%; Charging voltage: 5V; Executive standard: Qi Phone port which has wide top and narrow bottom uses reverse; Note: Phones with Qi standard transmitter can directly use.