Wireless doorbell. Consists of a weatherproof bell button (IP44, with nameplate and confirmation LED) and a bell unit with a Euro plug for Euro/Schuko sockets. Bell unit with a 4-LED flashing light and optional bell tone. A total of 24 melodies can be selected. Four adjustable volume levels (68 - 82dB(A)/0.3 m) or silent optical signal only via flashing light. Wireless range up to 200m (outdoors). Power supply: Bell button: 1x 12V MN21/23A alkaline battery (included), bell unit: 230V, 50Hz. Easy installation of the bell button using an adhesive pad or screws (both included). Dimensions: 34 x 88 x 20mm (bell button), 80 x 87 x 28mm (bell unit). Sets can be combined, including with the FD25 wireless passage detector. Can be expanded with additional FD2K bell buttons, FD2B motion detectors and FD2G gong units. Up to 8 bell buttons/motion detectors can be registered to one gong unit, with individual melodies for easy call differentiation. The number of gong units per bell button/motion detector is not limited, but please note the wireless range.