If your computer is connected to the SL04 box, and the IP of the box is the default 2.0.0.44, then you now click these buttons, it will control your box remotely, the easiest way to test is to connect the box to the LED light, and see the LED change. Note: You need to capture 3 files on your TF card, and the file names are 1.dmx, 2.dmx, and 3.dmx, and make a playlist file.