for up to 32 residential units, interconnection of up to 6 built-in bell button extensions on the built-in door loudspeaker possible, can be integrated behind on-site front panels, plug-in screw terminals for connecting 32 bell buttons via 8 x 4 button matrix, 2 indoor stations can be assigned to each on-site bell button, acknowledgement tone when the bell button is pressed, on-site bell button can be used to switch on the light, permissible ambient temperature: -25 degrees C to 55 degrees C, dimensions: H 56 mm x W 88 mm x D 30 mm
