This NEC, I believe ties for the record of the least controls I've ever found on a "control panel".
It's simple. There's the Power switch. Press once for on, twice to power down. And right next to it is the Source button allowing you to choose from available sources, including those for the media player (there are two USB ports and the SD card). For everything else, use the remote control.
The rest consists of the navigation area, with its four arrows in a diamond configuration, enter button in the middle of them. In addition there four outer buttons. Auto Adjust is to the left of the up arrow while Digital zoom is to the right. Digital zoom has about 25 steps, but one directional only. You can exit or go all the way to the maximum zoom, and then one more turns it off. If there's a way to zoom out in steps, I missed it.
But back to the remote. in the lower left corner is the Menu button, and in the bottom right, Exit, for moving back up a level in menus. That it's it for the remote which runs on a provided, (common) lithium-ion button battery. The remote does the job, but again, since there's no real control panel, don't lose the remote!