Onvis Door Sensor, Smart Wireless Door Window Contact Sensor for Home Security System, Thread & Bluetooth Version, No Onvis Hub Required, Compatible with Apple Home etc.

Requires a thread/matter router such as Apple HomePod mini or AppleTV4K 2021 or later.

In very good condition, will require a CR2450 battery and some 3M or similar double sided stickers to attach to door or window.