A sound detector.
Sound detector
A cobra detector is a radar detector. Radar detectors work the same way a radio receiver does. The radar detector looks for frequencies that a radar gun uses.
metal detector
To use a smoke detector tester spray properly, follow these steps: Press the test button on the smoke detector to ensure it is working. Hold the tester spray about 6-12 inches away from the detector. Spray a short burst of the tester spray towards the detector. The smoke detector should sound an alarm within a few seconds if it is functioning correctly. If the alarm does not sound, replace the batteries or the detector itself.
If you hear the low battery smoke detector sound in your home, you should replace the battery immediately to ensure the detector continues to function properly and keep your home safe from potential fires.
Sure, but what you would have to do would be to put the switch in the TEST circuit of the detector.
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Sonic detectors pick up sound waves and motions When things move, they often create changes in surrounding Read more: How Does a Sonic Motion Detector Work? | eHow.com http://www.ehow.com/how-does_4564490_sonic-motion-detector-work.html#ixzz1R9OT0diL not all written by me
The Hand Held Meter Detector will work on batteries, as long as you connect each lead to the battery correctly.
a carbonmonoxide detector usually will sound off