1、Applications: Sound mixer for extended control of tuning, mixing instruments, CD players, tape players, computers, cell phones, tablets. 2、Plug And Play: Stereo mixer is small and portable, plug and play, no external power required. It is very convenient. 3、Control Knobs: Stereo mixer is a four way independent control knob, for each channel volume fine amplification, without interfering with each other. 4、Stereo Interface: Sound mixer is four in one out, all 5mm stereo input and output, can also be used as a 4 in 1 out stereo splitter, clockwise rotation to adjust the volume. 5、Premium Material: Stereo mixer is acrylic material, gold plated interface can effectively avoid poor contact to ensure stable signal transmission. 1 x Sound Mixer  1 x Instruction Manual1 x Foot Pads (4pcs) Item Type: Sound Mixer PassiveMaterial: AcrylicInput Impedance: 10KΩ to 47KΩOutput Impedance: 2.5KΩ to 10KΩGain: -12dB MaximumInterface: 3.5mm Sound Interface