Is a stereo 4-way passive mixer for extended control tuning, Mixers, CD Players, Tape Players, Computers, Cell Phones, Tablets, etc. No battery or other power sources.The device can also be used as a 1 in 4 out stereo splitter to adjust the volume by turning clockwiseOutput: Used to connect mixer output or other output device RCA jacks. In1-4: Controls the signal level of inputs 1-4.Four stereo RCA inputs stereo RCA output,Four independently adjustable 100k ohm potentiometers.Input Impedance: 10K ohm to 47K ohmOutput Impedance: 2.5k ohm to 10K ohmGain: -12dB (max)size: 8.3 x 5.2 x 3.8cmMaterial: plasticcolour: blackPackage Contents:1 x Audio MixerOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.