Both input and output are RCA lotus interface, one set of two-channel audio input, five sets of two-channel output, can be connected to five power amplifiers or active speakers, with gain compensation 3 times amplification (9.5db);Frequency range: 20HZ-20KHZInput impedance: 50KOutput impedance: 600 ohmsGain: 9.5dbThis machine has low noise and high fidelity, and can work stably with power on for a long timePlease use a low-ripple power supply for power supply, the power interface is 5.5 x 2.1 inside positive and outside negativeColor: BlackMaterial: plastic+metalPackage Contents:1 x Tone ControllerOnly 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.