The sensor uses an invisible beam motion you place out from a door frame or other area you wish to monitor and when the combination of heat and movement are detected it plays either a ding or ding dong tone you choose.
Laser beam door alarms.
When a person walks through the beam the circuit is interrupted and this causes the alarm to sound an audible warning.
Sabre door handle alarm 110db door alarm for home security audible up to 600 feet 185m away vibration triggered security alarm sounds when door knob is touched from outside 3 9 out of 5 stars 918.
This high tech device creates an invisible infrared beam up to 60 feet long between the two devices and sounds a loud alarm or pleasant chime when the beam is crossed.
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Seco larm enforcer wireless door entry alert with chime open box see931cs22rfcq ob.
The system consists of a send receive unit which transmits an ir beam across the doorway onto a prismatic reflector mounted on the opposite side.
Seco larm enforcer door entry alert speaker chime.
Includes 6 alarm door window contact sensors.
This 120 db compact magnetic door window alarm sounds when a window or door is opened.
Entry alert beam chime alarm invisible beam alert 671 entry chime sounds when invisible beam is crossed.
Amazing beam new improved photo safety beam 2 beam sensor beam detector photo beam photo switch garage door sensor universal 3 8 out of 5 stars 10 99 99 99.
Seco larm enforcer reflective beam sensor with square reflector 35 see931s35rrq.
Seco larm enforcer door entry alert with chime.
The alarm includes entry.
With this product the sound emanates from the sensor and does not send the sound to a remote location.
Supreform ip67 waterproof universal 10 30vdc safety retro reflective photoelectric beam sensor for 12vdc and 24vdc gate opener garage door sensor up to 40 feet sensing range pre wired 6 6 feet cord.
Motion sensor alarm 120 db 5 door alarm modes 4 volume levels with remote control indoor motion detector alarm for home shop store 3 9 out of 5 stars 164 19 99 19.
3 9 out of 5 stars 21.
The beam is reflected back to the receiver to complete the circuit.