My guess is they have both ways for having a button installed in the cab if needed or being able to quickly changing at the point of install if not hooking up the terminal
Several Minnesota agencies used them. Minneapolis and Bloomington if I am not mistaken being the most common. I believe there was an agency in Texas that did as well.
Car 350 - Primarily used by the Paramedic on duty for scene response
Former car 350 - will be retained for now as a back up
Ambulance 15-
Ambulance 14-
Ambulance 12- Due for replacement spring 2021
I used a hair dryer on high heat to heat up the double sided tape then carefully pried with a flat blade screwdriver on the one that I had and parted out.