The Mini Passive Stereo Mixer is a stereo four-way passive mixer for extended control of mixing, mixing instruments, CD players, tape players, computers, mobile phones, tablets, etc. No batteries or other power supplies are required OUTPUT: jacks for connecting mixer outputs or connecting other output devices IN 1 - 4: Controls the signal level from inputs 1 - 4 4 sets of stereo Lotus Socket inputs, 1 set of stereo Lotus Socket outputs 4 adjustable 100K ohm potentiometers Input impedance: 10K ohms to 47K ohms Output impedance: 2.5K ohms to 10K ohms Gain: -12dB MAX Channel: 4 channels Colour:Black Material:Plastic Package Contents: 1 x Audio 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.