【Expand Audio Setup】This audio splitter allows you to connect multiple devices such as headphones, speakers, subwoofers, amplifiers. to a single audio source. 【Versatility and Flexibility】With combination of 3.5mm auxiliary and RCA L/R, it supports 3.5mm aux input, 3.5mm & RCA L/R output; or RCA L/R input, 3.5mm & RCA L/R output.