4-channel, supports 4 inputs and 4 outputs.Input and output isolation, with isolation insulation withstand voltage of more than 300Vp-p. Low noise floor, no 50Hz AC noise and high-frequency interference, high sound quality.Point-to-point unbalanced transmission audio, input and output can be from the front and rear panels. Strong anti-common mode interference capability, CMRR 60dB.No IP settings required, no security vulnerabilities. Plug and play, no power supply and drive required.Isolated filtered audio transmission, up to 450-600 meters. Built-in transient, surge suppression, and anti-static protection circuits.Analog ground loop isolation and noise reduction processing. Equipment insertion loss: less than 0.5dB Return loss: 18dB Input level range: 0.5Vp-p to 3Vp-p Frequency response: 20Hz-20kHz, error within 0.2dB (reference 1kHz) Common mode rejection: 68dB@1kHz Stereo channel isolation: 62dB Input impedance: 600 Input interface: 4-way with line interface Output impedance: 600 Output interface: 4-way female interface Rated loss: less than 0.5dB (reference 1kHz, 1Vrms) Insulation resistance: 100M at DC1000V Isolation voltage: AC50Hz-60Hz, 0V-1500V Maximum input level: +6dBu Application: 1. safe transmission between systems and protect equipment from being burned by ground voltage difference 2. the current acoustic interference noise generated by the car/server projection LED link mixer 3. Improve sound, remove burrs, remove digital flavor, and purify sound 4. the current acoustic noise generated by impedance mismatch between devices 5. the current acoustic noise between simultaneous interpretation equipment and mixer Colour:Black Material:Aluminum alloy Package Contents: 1 x Audio isolator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.