Digital Wireless Microphone for Professionals (Two mics)

Specifications 

Input Voltage: 5V

Battery Capacity: 200mAh/1000mAh Working Time: about 5 hours Charging Box: can recharge the microphone about 5 times

Signal to Noise Ratio: 64DBM adaptive noise reduction

Transmission Delay: 30MS

Sensitivity: -42DB

Frequency Response Range: 20-20KHz

Transmission Distance: accessible 50 meters

Receiver interface: USB -C / Lightning / 3.5mm