1、2 IN 2 OUT: Mix amplifier adopts 2 output and 2 input, 3.5mm jack design, when inputs 2 sound sources, the output will be mixed sound effects. 2、PRACTICAL DESIGN: 2 inputs can enter 2 different sound sources at the same time, and the plugs inserted will not affect each other, the output is also, you can connect 2 headphones or 2 amplifiers at the same time. 3、WIDE COMPATIBILITY: The input is compatible with DVD, CD, MP3, TV, mobile phone, computer, tablet, guitar, bass, etc. The output is compatible with speakers, reverbs, AV receivers, rear amplifiers, headphones, etc. 4、PLUG AND PLAY: This stereo mixer audio distributor is easy to use, no need to install special software, applications or drivers, plug and play. 5、ALUMINUM ALLOY SHELL: Stereo audio mixed distributor adopts excellent aluminum alloy shell, which is light weight, hard to corrode, has good heat dissipation and long service life.