The electronic signal insert has 3 button inputs that you can assign different melodies to. With a connected button, you can call up the melody of the associated button input and also select a new melody. There are 5 different melodies available. Use buttons with a normally open contact or buttons with an orientation light to control the button inputs. Suitable for installation in a 60 mm installation box. Without claws, for screw fastening. Nominal voltage 8-12V AC. To be completed with a central plate for acoustic signal generator system M 3520xx, MEG4450-03xx /-04xx.