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)

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)

Xiaomi Mi Door and Window Sensor 2

Aqara Door and Window Sensor T1