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Aoje-Link MC-51 NC Wired Magnetic Switch Door Window Reed Switch Micro Alarm Magnetic Contact Security Silver Gray 4pcs ship04 ✔✔✔ MUST USE High QualityAoje Link MC 51 NC Wired Magnetic Switch Door Window Reed Switch Micro Alarm Magnetic Contact Security Silver Gray 4pcs Magnetic Reed Switch Alarm Surface Mount Wired Contact Sensor Connect to the alarm. Sharp alarm will be heard when someone opens window or door in arming status,The reed switch is an electrical switch operated by an applied magnetic field. Keep your house safe with this door security alarm. 1. By screws to install, High Quality Zinc