Input and output are RCA lotus interface, one two-channel audio input, sets of two-channel output, can be connected to power amplifiers or active speakers, with gain compensation 2 amplification The internal use of and negative power conversion circuit, the actual power supply is doubled, the operating voltage range is DC 5V-16V. A of 6 are used, 1 chip is used as a gain boost, and 5 drive groups respectively. Stereo output, low noise and high fidelity, long-term power on and stable work Please use a low-ripple power supply compatible with power supply, pay attention to the and negative poles, they will burn if they are connected reversely! The power interface 5.5x2.1 is and negative. The volume of each group is controlled separately, and the gain compensation is about 2 (6DB) Size: 11.8x7.5x4.5cm colour: black Material: metal Package Contents: 1 x Stereo Audio Mixer Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.