Mini passive stereo mixer for extended control tuning, mixing instruments, CD players, tape players, computers, mobile phones, tablets, and more. No battery or external power source required. Can also function as a 1-in-4-out stereo distributor with volume adjustment.OUTPUT: Connects RCA to mixer output or other output devices. IN 1-4: Controls signal level from inputs 1 to 4. Features 4 stereo RCA inputs and 1 stereo RCA output. Equipped with four independently regulated 100K ohm potentiometers. Color: Black Material: Metal Input impedance: 10K ohms to 47K ohms Output impedance: 2.5K ohms to 10K ohms Gain: -12dB MAX Net weight: 0.2 kg Product dimensions: 83 x 52 x 38 mm Package contents: 1 x Mini stereo four-channel passive mixer Note: Light and display differences may cause slight variations in color. Measurement error allowed is +/- 1-3 cm.