Frequency range: 2.4GHz Charging voltage: DC 4.8~5.4V Transmission distance: 20 meters (barrier-free) Human obstacle distance: about 7m Microphone: digital microphone Working time: 5h Charging case: it can charge the microphone 4-5 times Signal-to-noise ratio: 64dBm Start-up current: 1.5~6mA Charging interface: Type-C Transmission delay: 18MS Standby current: 4.3~5.5mA Sensitivity (Microphone): -26dB Microphone battery capacity: 80mAh Antenna type: ceramic antenna Charging current: 65mA Frequency response range: 20-20KHZ Charging case battery capacity: 300mAh