Features 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 3.5mm 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. specificationItem Type: Sound Mixer Passive_x000D_ Material: Acrylic_x000D_ Input Impedance: 10K to 47K_x000D_ Output Impedance: 2.5K to 10K_x000D_ Gain: -12dB Maximum_x000D_ Interface: 3.5mm Sound Interface PackageList 1 x Sound Mixer 1 x Instruction Manual 1 x Foot Pads (4pcs)