The coaxial unbalanced signal line transmission of ordinary music players is changed to balanced line to meet the long-distance transmission requirements. The isolator is an effective tool for converting unbalanced signals and balanced signals. Input channel: supports four-way channel input interface Output channel: supports four-way channel interface output Isolation transformer: 4 professional isolation transformers are used to independently isolate 4 channels Frequency bandwidth: 20hz-20Khz Isolation voltage: AC50HZ-60HZ 0V-1500v Output loss: Less than 2db Input and output impedance: 600 ohms (AC impedance): 600 ohms (AC impedance) Power supply: external power supply, direct plug-in Product size: 90mm x 60mm x 25mm Colour:Black Material:Aluminum Alloy Package Contents: 1 * 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.