Specifications of the bell buttons:

	Push button: Black plastic Push button diameter: Ø 10 mm Diameter insgesamt: 18 mm
	Push button: Aluminium Push button diameter: Ø 11,5 mm Diameter insgesamt: 22 mm
	Push button: Black plastic Push button diameter: Ø 11,5 mm Diameter insgesamt: 22 mm
Switching capacity max.	12 V AC/DC 1,5 A
Switching capacity min.	5 V / 1 mA
Connection	0,6 to 0,8 mm wires
Switching distance	0,8 mm to 2 mm
Total actuation path	1,2 mm to 3 mm
Operating temperatur	-20 to +60 °C
Protection class	IP54 installed in a vertical plate

The button contacts habe to be connected to the existing doorbell.
Bell power adapter, bell wire and bell are not included.