That sure looks like the infamous Remote Control Thermostat Montana used in 2005, 2006, and 2007 (??). It generally was considered a POS and many of us replaced it. Here is a link to an *OLD* Thread on this thermostat, its replacement, and, at one time pictures, which have since disappeared due to Photo Bucket changing its picture hosting rules. This is a long Thread, which is interesting to read, but much of the early Posts are outdated due to changes by Dometic. However there has been some recent activity, and successes, in replacing the thermostat. Be sure to read pages #17 and #18 for the most current info.
https://www.montanaowners.com/forums...ead.php?t=8145