All sockets are stereo 3.5mm, with one input and two output channels that deliver the same signal. When two inputs are used simultaneously, the output will be a mixed audio signal. Two inputs allow connection of two different sound sources at the same time, and plugging in both will not affect each other. The output supports connecting two headphones or two amplifiers simultaneously. The first-stage op-amp is NJM4580, and the second-stage driver is NJM4556A high-current operational amplifier. Working voltage: DC 5-20V Color: Black Material: Metal Package Contents: 1 x Stereo Mixer 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 to vary slightly from the real thing. Measurement allows an error of +/- 1-3 cm.