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2. Motion detector - Wikipedia

   en.wikipedia.org/wiki/Motion_detector

   A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.

3. Car alarm - Wikipedia

   en.wikipedia.org/wiki/Car_alarm

   Motion sensors monitoring the vehicle's interior are installed in some higher end models. The simplest aftermarket alarms are one-piece units with a siren and control module. The most common type of sensor is a shock sensor and two wires (12-volt constant power and ground) which are connected to the car's battery.

4. Home security - Wikipedia

   en.wikipedia.org/wiki/Home_security

   Motion sensors create zones which cannot be accessed without sounding an alarm. Most cameras do now have a motion detection function, with some brands having thermal detection so they only activate when sensing a heat signature. This function is used so cameras do not pick up false alarms from trees blowing in the wind. [11]

5. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   It contains a light source, which is positioned indirectly to the light sensitive electric sensor. Normally, light from the light source shoots straight across and misses the sensor. When smoke enters the chamber, it scatters the light, which then hits the sensor and triggers the alarm. Photoelectric smoke detectors typically respond faster to ...

6. Alarm device - Wikipedia

   en.wikipedia.org/wiki/Alarm_device

   safety alarms, which go off if a dangerous condition occurs. Common public safety alarms include: civil defense siren, also known as tornado sirens or air raid sirens; fire alarm systems. fire alarm notification appliance "Multiple-alarm fire", a locally specific measure of the severity of a fire and the fire-department reaction required. smoke ...

7. Smith & Wesson motion detector alarm - 80% off - AOL

   www.aol.com/news/2008-01-25-smith-and-wesson...

   The Daily Deal for Friday, Jan. 25, 2008 is a Smith & Wesson motion detector alarm with programmable keyboard that is selling for the astonishing price of $5.98. That's 80% off the regular price ...