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YL-333 Magnetic Anti-theft Alarm for Door/ Windows 200mm Trapezoidal 4 Start Lead Screw 8mm Thread 2mm Pitch Lead Screw with Copper Nut Mornsun LI60-20B12PR2 AC/DC 60W DIN-Rail```html YL 333 Magnetic Anti theft Alarm for Door Windows Protect your home, office, or workshop with the YL 333 Magnetic Anti theft Alarm a compact, wireless magnetic contact sensor that triggers a loud alarm when doors or windows are opened without authorization. Ideal for DIY security systems, IoT projects, and standalone intrusion detection. Available at The Engineer Store, Bengaluru, India. Fast shipping, 7 day warranty on manufacturing defects,