Measy AU688-U 20 Channels Wireless Guitar System Rechargeable Musical Instrument Transmitter Receiver, AU688-U Black % Media Player and the red light is

and the red light is on when the signal reaches 3dB below the distortion

speed matching to help extend the WiFi signal

500X metal detection lens: suitable for circuit board maintenance and inspection

HD recording function

Measy AU688-U 20 Channels Wireless Guitar System Rechargeable Musical Instrument Transmitter Receiver, AU688-U Black % Media Player and the red light is1. 100 meters transmission distance (330FT) 2. Built in lithium battery, charge once, battery life 5 6 hours 3. Strong anti interference, can penetrate walls 4. Built in damping shaft, 270 degree rotation to adjust orientation 5. Plug and play, lossless sound quality 6. Working channel: Channel 20 7. Receiving sensitivity: 90dBm 8. Frequency response range: 20 20000Hz 9. Frequency range: U frequency 10. Delay time: less than 0. 5ms 11. Sampling rate: