Long-Range Burglar Alarm Using Laser Torch
Since the anti-theft alarm of the laser torch usually only works in the dark, this remote photoelectric alarm can work during the day and can also warn you of intruder compounds in a large area. The alarm includes a laser transmitter and receiver unit, which should be installed on the opposite pillar of the entrance door. Once someone enters and interrupts the laser beam, the beam falls on the receiver, and the buzzer in the circuit sounds an alarm.
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