2-in-1 Sensing: Tracks open/closed states via magnetic induction and measures ambient room brightness.. Wireless Protocol: Uses Bluetooth 5.1 BLE for direct pairing and energy efficiency.. Power Source: Powered by a single, user-replaceable CR2032 coin battery (pre-installed).. Form Factor: Extremely light and compact, measuring 34.0 x 32.7 x 14.5 mm.. Mounting Clearance: Includes double-sided adhesive stickers; the main sensor and magnet must be mounted with an alignment gap of under 18 mm when closed.
