Wireless passage detector for indoors. Consists of PIR motion detector (horizontal detection: 5m x 90°, vertical detection: 9m x 40°) with wall bracket and ball joint as well as gong unit with Euro plug for Euro / Schuko sockets. When motion is detected, the gong unit warns with a 4-LED flashing light and either a gong or siren sound. 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. Radio range up to 70m (outdoors). Power supply: motion detector: 2x 1.5V AAA batteries or 5V DC micro USB power supply (item no. 32122), delivery without batteries / power supply, gong unit: 230V, 50Hz. Housing dimensions: 85 x 54 x 35mm (motion detector), 80 x 87 x 28mm (gong unit). Sets can be combined, also with wireless doorbell FD20. Can be expanded with additional bell buttons FD2K, motion detector FD2B and gong units FD2G. Up to 8 bell buttons / motion detectors can be registered to a gong unit, with individual melodies for easy call differentiation. The number of gong units per bell button / motion detector is not limited, but note the wireless range.