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YL-333 Magnetic Anti-theft Alarm for Door/ Windows Octal 3-state Inverting Buffer IC - 74HC540 Wide Compatibility: Powers Raspberry Pi```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,