All sockets is stereo 3.5mm, input one way, both 2 ways output is .And input two at the time, then output will be the mixed sound.Two inputs can input two different sound sources at the time, and plug in at the time will not affecd.each other. The output is also, You can connect two headphones or two amplifiers at the time.The first stage OP AMP is NJM4580, and the second stage driver is NJM4556A high-current operationalAMP, all of them are imported,which is stable low noise.Working voltage:DC 5-19VPlug Type:EU Plug,it applies to Indonesia, Germany, , Spain, and so onType: Audio MixerModel Number: AU-202color:BlackMaterial:MetalPackage Contents:1 x Mixer board1 x adapter(The appearance style is random, and the specified appearance style cannot be )Only the above package content, other products are not included.Note: Light reflection 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.