Surface Mount Wired NC Door Window Contact Sensor Alarm Magnetic Reed Switch | eBay
Life Safety Alarm w/Magnetic Contact by JL Industries - AED Superstore - 14A-MAG
945WH-M - Alarm Magnet (for Any Non-Recessed Resideo Honeywell Home Wireless Door/Window Alarm Contact)
Basic Magnet Pull Cord Alarm | Performance Health
Amazon.com: 10pcs RC-33 NC Recessed Wired Window Door Contact Sensor Alarm Magnetic Reed Switch White : Tools & Home Improvement
Protekt® Magnet Alarm - Proactive Medical Products
GE Personal Security Window or Door Alarm, White, 4 Pack
GaussAlert Magnetic Field Strength Alarm System
TANE Wired Side Lead Surface Mount Magnetic Contact WHITE Color Alarm Window Security Magnetic Door Switch Magnetic Contact Switch Reed Switch Normally Open Closed Loop + UL Listed FM-102-WH - FPC Security
Honeywell 5899 - Magnet for 5816 Wireless Door Sensor and Window Sensor - Alarm Grid
Magnetic Wired Door Window Sensor Switch Home Alarm System for Arduino Wired | eBay
TANE Wired Side Lead Surface Mount Magnetic Contact BROWN Color Alarm Window Security Magnetic Door Switch Magnetic Contact Switch Reed Switch Normally Open + UL Listed FM-102-BR - Walmart.com