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Noorio Wireless Contact Sensor for Doors and Windows, App Alerts, Triggers Siren, 2-Year Battery Life, Require Noorio Hu [Instant Alerts] Whenever the sensor and the receiver is separate, a notification will be sent to your phone app, and thRengu 
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Magnetic Reed Switch Surface Mount Wired Door Contact Sensor Alarm Magnetic Reed Switch Window Security White Contact Sw Protective Switch for Window and Door: The magnetic reed switch, which are used to protect doors and window. They are gr16% Off Eve 
Eve Door & Window (Apple Home) – Smart Contact Sensor for Doors/Windows, Notifications (Open/Closed State), Automatic Co Eve Door & Window requires iPhone or iPad with the latest version of iOS/iPadOSCPVAN 
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