Features Good Materials - Combination of premium ABS and aluminum alloy material to ensure lossless signal and anti-interference work. Reliable Use - NJM4580 first phase operational amplifier and NJM4556A second phase controller, capable of connecting 2 headphones or 2 amplifiers. BETTER EFFECTS When you input dual stereo signals, the audio mixer output will be the mixed sound with good effects. EASY TO INSTALL - It works stably with a DC 5-19V power supply, and the installation is also very simple, just plug and play. 2 inputs and 2 outputs - It can input or output two different sources at the same time without affecting each other, stable and useful. Specification: Element Type: Audio Mixer Product material: ABS, aluminum alloy Power supply: DC5-19V Package List: 1 x Audio Mixer Small Note: 5-19V DC power supply, preferably a linear power supply, otherwise the switching power supply tends to emit humming. Package List 1 x Audio Mixer