A surveillance and alarm device for room spaces, comprising an infrared radar for controlling the lights as well as a fire and burglar alarm. A basic alarm is provided with a light controller to be connected in series with a ceiling light fixture in a room under surveillance, and is further provided with a microprocessor 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 or a wireless remote controller or on the basis of a command issued by a key switch. The light controller included in the basic alarm switches on said lighting fixture as someone enters a room under surveillance or flashes said lighting fixture in connection with an alarm.
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