Meross Smart Door Window Sensor, Mini Contact Sensor for Security and Home Automation, WiFi Alarm System, Real-Time Alert, Works with HomeKit, Alexa, Google, SmartThings, Meross Hub Included Start Kit Smart Door Window Sensor Start Kit(with Hub)

Onvis Thread-Enabled HomeKit Door Window Contact Sensor,Wireless Mini Low-Energy Contact Sensor for Alarm System and Smart Home Automation, No Hub Required(2Pack)

Door and Window Sensor T1

eufy Security Entry Sensor, Detects Opened and Closed Doors or Windows, Sends Alerts, Triggers Siren, 2-Year Battery Life, Requires eufy Security HomeBase, Links with HomeBase-Connected Devices