Reponry & Mute Mode In the noise reduction mode, press and hold the volume button to enter reverberation mode, and the echoes like karaoke, so you can also use it for recording singing chants. Press and hold the + volume button to enter mute mode. When you need a silent meeting, interview, etc., you can instantly mute with a single touch, making it more convenient 2.4 GHz Band & Automatic Pairing The wireless microphone uses a 2.4 GHz band so it can provide long distance transmission up to 164.4 ft (50 m) if there is no obstacles. Video and audio syncing with 0.031 second delay. Enjoy playing with less sound delay. The transmitter and receiver will automatically pair in about 3 seconds after turning on the power supply, so it can be recorded smoothly 360? Sound Collection & Noise Reduction This is a nondirectional wireless microphone. Record stereo audio in any direction. The wireless pin microphone features a DSP noise reduction chip to reduce ambient noise and noise components, and provide clear audio transmission with 80dB S/N ratio. The 3.5mm headphone terminal allows you to monitor the audio in real time. (Excluding malfunctions caused by intentional or negligent acts of the customer.) Most products come with a 30 day change of mind policy.