The coaxial unbalanced signal line from standard audio devices is converted to a balanced line to support long-distance transmission. The isolator effectively converts between unbalanced and balanced signals. Input channel: supports four-channel input interface Output channel: supports four-channel output interface Isolation transformers: 4 professional isolation transformers for independent channel isolation Frequency bandwidth: 20Hz20kHz Isolation voltage: AC 50Hz60Hz, 0V1500V Output loss: Less than 2dB Input and output impedance: 600 ohms (AC impedance) Power supply: External power supply, direct plug-in Product dimensions: 90mm x 60mm x 25mm Color: Black Material: Aluminum alloy Package contents: 1 x Audio Isolator Note: Other items not included. Lighting and display differences may cause slight color variations. Measurement tolerance: 13 cm.