Photoelectric Beam Sensors work similar to a smoke detector except in reverse, instead of the sensor waiting for the beam to turn on to activate the alarm, it waits for the beam [or light] to be blocked or interrupted and this in turn activates the alarm [ie walking across the beam blocks the transmission of light causing an alarm].

These are extremely reliable and false alarm resistant, there are many and varied types on the market. Prices
start at around $350. for a standard set. There are indoor and outdoor types as well.

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