4-Way Audio Switch Splitter RCA L/R Stereo Audio Switch 4 IN 1 OUT or 1 IN 4 OUT enable your device to connect to three peripheral devices. Select the audio input between 1/2/3/4 with the knob switch to get an output. Or select the audio output between 1/2/3/4 to get an input. Easily switch different audio in and out using professional audio rotary switch/lossless equipment. Eliminates the need to pull and plug cables. Made from a rugged aluminum case it has strong anti-interference and lossless signal transmission. Does not need to connect the power supply plug and play will not affect the sound quality.