They work by having an emitter side that sends out a beam of human invisible ir light then a receiver across the way which is sensitive to that same light.
Infrared beam sensor kit.
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Door minder infrared beam sensor kit ck1620.
Infrared security beam kit uk.
When the beam is broken a relay is tripped which can be used to sound a bell or alarm.
This door minder infrared beam sensor kit uses an infrared beam to monitor door passage ways or any other area.
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When something passes between the two and its not transparent.
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This replacement garage door safety sensor kit uses an invisible infrared beam across the opening of the door the system detects any object passing through the led beam of light and automatically reverses the closing garage door.
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Suitable for detecting customers entering a shop cars coming up a driveway etc.
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The genie safe t beam system is designed to ensure maximum safety for your garage door opener operation.