All sockets is stereo 3.5mm, input one way, both 2 ways output is same.And input two at the same time, then<br> output will be the mixed sound.<br> Two inputs can input two different sound sources at the same time, and plug in at the same time will not affect<br> each other. The output is also, You can connect two headphones or two amplifiers at the same time.<br> The first stage OP AMP is NJM4580, and the second stage driver is NJM4556A high-current operational<br> Working voltage:DC 5-20V<br> Colour:black<br> Material:Metal<br> Package Contents:<br> 1 x Stereo Mixer<br> Only the above package content, other products are not included.<br> 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.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.