Interview, recording microphone series

Wireless frequency range: 646-670 MHz
Audio frequency response: 40Hz-18kHz
Number of channels: 20 channels (10 channels for A and B)
Wireless transmit power: ≤10mW
Effective distance: 80 meters (outdoor open space)
Signal-to-noise ratio: ≥90
Use time: 8-10 hours
Charging time: 3-4 hours
Modulation: DQPSK
Transmission method: wireless transmission
Product specification (LxWxH): 88x57x14mm
Monomer weight: 105g