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 amplificationThe internal use of positive and negative power conversion circuit, the actual power supply is doubled, the operating voltage range is DC 5V-16V. A of 6 chips are used, 1 chip is used as a gain boost, and 5 chips drive groups respectively. Stereo output, low noise and high fidelity, long-term power on and stable work use a low-ripple power supply for power supply, pay attention to the positive and negative poles, they will burn if they are connected reversely! The power interface 5.5x2.1 is positive and negative.The volume of each group is controlled separately, and the gain compensation is about 2 (6DB)Size: 11.8x7.5x4.5cmcolour: blackMaterial: metalPackage Contents:1 x Stereo Audio MixerOnly 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.