Wireless Lavalier Microphone Omnidirectional Condenser Mic with 2 Transmitters 1 Receiver for Recording Ultra-compact Size: The BY-V series is small and light, easy to carry, the weight of the transmitter is 9.5g, and the receiver is 6g. It's easy to use, just plug in the receiver and start recording right away 2-in-1 Live Broadcast & Phone Charging: A USB-C charging port is designed on the side of the BY-V series receiver. During recording, if your device needs to be charged, you can connect to this USB-C port to charge it Noise Cancellation: NR button on the transmitter activates a noise-canceling mode that filters out most ambient noise, leaving only pure sound Long Battery Life: The transmitter can work continuously for 9 hours after fully charged, while the receiver does not need to be charged, which saves the trouble of interrupting the recording to charge the device Specifications: Transmission Type: 2.4GHz Directivity: Omnidirectional Frequency Response: 20Hz-16kHz SNR: 80dB Sensitivity: -42dB Transmission Range: 50m (without obstacle) RX Output Power: 6db TX Battery Capacity: 95mAh TX Charging Time: about 2 hours TX Battery Life: about 9 hours Receiver Power Supply Mode: external equipment power supply BY-V2-TX: 9.5g BY-V2-RX: 6g BY-V2-TX: 52.22x25.23x19.75mm BY-V2-RX: 43.92x23.5x9.3mm