Features: 1.Stereo Mixer: This mini passive mixer can easily extend, control and mix the stereo into the effect you preferred. 2.4 Channels: Comes with 4 stereo RCA inputs and 1 stereo RCA output, can work as a 1in 4 out stereo distributor. 3.Wide Application: Enables flexible application on CD player, tape player, computer, cell phone, tablet and so on. 4.Simple Operation: Adjustment is very simple with clockwise rotation, and no battery or power supply is required. 5.Easy Carrying: The stereo mixer has a light weight and a small size, and both storage and carrying are very easy. specification:Item Type: Stereo Mixer Material: Iron Colour: Black Input and Output: 4 stereo RCA inputs and 1 stereo RCA output. Potentiometer: 4 independently adjustable 100k ohm potentiometers. Input Impedance: 10K ohm to 47K ohm. Output impedance: 2.5k ohm to 10K ohm. Gain: -12 dB maximum. PackageList: 1 x Stereo Mixer 1 x User Manual