1、EASY TO USE: No batteries or other power source required. The stereo mini mixer can also be used as a 1 In 4 Out stereo splitter with clockwise volume adjustment. 2、INPUT AND OUTPUT: 4 stereo RCA inputs and 1 stereo RCA output, OUTPUT: for connecting the RCA jack to a mixer output or other output device; IN 1-4: controls the signal level from inputs 1-4. 3、WIDE APPLICATION: Stereo four channel passive mixer for extended control of tuning, mixing instruments, CD players, tape decks, computers, mobile phones, tablets, etc. 4、SUPERIOR PERFORMANCE: Mini mixer produces the highest sound quality at all output levels, boasting ultra low noise operational for outstanding sound performance. Distortion free and easy to set up. 5、CONVENIENT: The modern design of the passive mixer looks great on any desktop, with large controls that are easy to use and small enough to avoid tangles of wires, clothing etc.