Features: brand new and high quality Mini passive stereo mixer is a stereo four-way passive mixer for extended control tuning, mixing instrument, C-D player, tape player, computer, mobile phone, tablet and so on. No battery or other power source required. The device can also be used as 1 In 4 Out stereo distributor clockwise to adjust the volume. OUTPUT: is used to connect RCA jack to mixer output or other output devices. IN 1-4: controls the signal level from input 1-4. 4 groups of stereo RCA input and 1 group of stereo RCA output, Four independently regulated 100K ohmic potentiometers. Specifications: Material:Metal Color:Black Size:Approx.8.5x5.2x4cm/3.35x2.05x1.57in Model: CX400 Channel: 4 channels Input Impedance: 10K ohms to 47K ohms Output Impedance: 2.5K ohms to 10K ohms Gain: -12dB MAX Option Type:Passive Mixer with European Plug;Passive Mixer with USA Plug Package Includes: 1 x Passive Mixer note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.