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Infrared Laser Alarm Switch Sound / Light Alarm Motion Senser Security DIY Kits

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How it works: In this study, the transistor as a switch. 1: No alarm. When a laser is irradiated onto the photosensitive resistor, transistor ended, active buzzer power off, stop chirping; light off. ...
Condition:New
Time left:8d 10h 43m
Item location:Hong Kong
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