The Nutone NA3008C has been discontinued. The M&S MC3 chime module is an identical substitute.
The NuTone NA3008C 8-note Chime Module is compatible with the NM100 and NM200 intercom master stations. When the bell button is pressed on a door station 1,2,4 or 8 notes ring throughout the intercom system. The chimes can be changed at the module so each door rings a different chime. Chime volume is adjustable. The maximum number of door stations that can be added to the system is 3.