This Reddit helped me a lot with my research before purchasing as well as figuring out some things that the manual missed so I wanted to share my experience with the remote of the MF 300 adjustable base I purchased a week ago. In the span of a week, the remote has stopped working twice. The buttons light up when pressed, but the bed is unresponsive.
Find the plug to your base. There should be a box attached to it with a green light. A bit further down the cord is a button that says PAIR/FLAT. If your base is in an upright position, use the FLAT to lower it.
Unplug the base from the outlet. Give it a few Mississippis before plugging it back in.
Hold down the PAIR button by the plug, cross your fingers and toes. Test the remote.
Am a bit perplexed why the remote is so easily unpaired, but this has worked for me thus far. I did get a 3 yr warranty with it in case as well.