This device simply splits a single stereo input (RCA jacks) to 3 equal stereo outputs (the headphone jacks)(1 in 3 out).
Inversely, the 3 headphone jacks can be integrated into one stereo output. (3 in 1 out)
Note, In order to make it a true 5.1 surround you need to connect the headphone jacks into surround amplifier.

Connectors: 2 x RCA Female , 3 x 3.5mm Female. Not include any cables.
>This is an Audio Splitter Adapter, supports 1 IN 3 OUT: converts stereo RCA analog to 3 x 3.5mm AUX (1/8 inch) stereo plugs. (for example laptop to headphone and active speaker, and 5.1 speaker)
>Use direction is reversible, it also supports 3 IN 1 OUT: 3 kinds of 3.5mm input sources (example computer,and smartphone and laptop), to a speaker.
>Compatible with 5.1 multimedia speaker systems etc.
>Design with isolate of common ground loop,there is no current hum or noise.
>Passive box. Plug and play. No need external power supply. No need driver. Small compact size in aluminum case.