The Aqara Door Sensor alerts your phone and triggers the Aqara Hub's local alarm upon unexpected door/window openings. Conveniently check your door or window, kids room and anywhere you want to be notified.
I have not tested the lot of 3 Aqara Door and Window T1 (non-Matter) Sensors with Zigbee Connection MCCGQ11LM, but they all looked new. I'll leave a follow-up if something was awry.