A surveillance and alarm device for room spaces, comprising an infrared radar (8) for controlling the lights as well as a fire and burglar alarm (8, 9, 10, 11). A basic alarm (2) is provided with a light controller (12) to be connected in series with a ceiling light fixture (1) in a room under surveillance, and is further provided with a microprocessor (9) or some other intelligent control circuit, adapted to control the alarm actions of said device either on the basis of a command issued by a lamp light switch (3) or a wireless remote controller (7) or on the basis of a command issued by a key switch (4). The light controller (12) included in the basic alarm (2) switches on said lighting fixture (1) as someone enters a room under surveillance or flashes said lighting fixture (1) in connection with an alarm.
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