This is a LED Controller for 12 / 24V DC RGB Light units.
Ethernet cables (RJ45) can be used to send/receive DMX512 signal.
If you want to use DMX controller to control 12VDC (or 24VDC) RGB LED light unit (such as Times Square RGB Light Bar) you need this.
(It can be used without a DMX controller.)
It can handle large current (8A for each channel); suitable for large lighting project.