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A "touch" sensor could work by several means including sensing a change in the "electrical capacity" of a sensor, which changes when someone touches it. Another type of sensor, often used in cars, senses small motions.
Other people have previously described the following puzzling invention:
"There are two laser beams at opposite ends . The laser beams hit each other.When anyone interrupts this beam a signal goes to the siren or aloud alarm.............Thats how it works.............."
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∙ 11y ago
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