1?��2 IN 2 OUT: Mix amplifier adopts 2 output and 2 input, 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.