BY-V series is a mini wireless microphone system that provides high quality sound for live streaming , vlogging, course recording, and other audio capturing applications.Transmission Type: 2.4 GHz. Polar Pattern: Omnidirectional. Frequency Response: 20Hz-16KHz. Signal-to-noise Ratio: 80dB. Sensitivity: -42dB. Operating Range: 50m (without obstacles). RF Output Power: 6dB. Charging Port: USB-C. Transmitter’s Battery Capacity: 95mAh. Transmitter’s Charging Time: Approx. 2 hours. Transmitter’s Battery Life: Approx. 9 hours. Receiver’s Power Requirement: Supplied by External Devices.