Mini Passive Stereo Mixer is a stereo 4-way passive mixer, For extended control tuning, Tuning instruments, CD players, tape players, computers, phones, tablets, etc. No batteries or other power sources are required. The device can also be used as a 1-into-4-out stereo splitter, for clockwise rotation to adjust volume. Output: For connecting mixer outputs or other output devices connectors. In1 - 4: Controls the signal level of inputs 1 - 4. Four stereo inputs and one stereo output, Four independently adjustable 100k ohm potentiometers. Input Impedance: 10K ohms to 47K ohms Output Impedance: 2.5k ohms to 10K ohms Gain: - 12dB max Colour:Black Material:plastic+Metal Package Contents: 1 x 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.