One input and four output, each output volume is independently controlled.Built-in mcu control circuit, perfect control of the impact sound of the power-off, static effect of the switch.With a 10dB, gain switch, you can increase the following volume, add the level to the device with lower output level, increase the volumeFrequency response 20-20kHz +/- 0.1dB, distortion 0.0001% output phase and input phase are the sameEach channel is independently processed by an op amp, and does not interfere with each other. The machine is equipped with TI's NE5532. The Buyer can replace different op amps according to their own preferences. The op amp supply voltage is +/- 12v; the op amp is positive. Jinggong produces gold-plated sockets with good contact and resistance to pluggingSolid-state filter capacitor, stepless audio coupling capacitor, Tk audio audio coupling, extremely feverGold-plated RCA socket, good contact, brushed aluminum casing, laser-engraving, high-grade, beautiful, atmosphericPower supply voltage: DC DC12V, current: 1A or more than 1A (Not include the power supply)Colour: SilverMaterial: aluminumSize: 11.7 x 10.7 x 3.5cmPackage Contents:1 x RCA HUB Audio DistributorOnly the above package content, other products are not included.Note: Light 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.