Wireless Smart Alarm 100DB Siren Door & Window Contact Sensor — Arm/Disarm, Timer Set, Works Without Network, Easy to Use

Compact wireless door/window contact sensor with a 100DB sound and light flash alarm. Designed for simple setup and daily use: it supports arm/disarm and timer set functions and operates without a network connection. Installation is tool-free — use the included 3M adhesive for a secure mount. Position the two pieces so their arrows face opposite directions and keep the gap between them LESS THAN 10MM; also make sure the sensor placement does not interfere with the door or window opening and closing. The unit provides real-time alarm notifications and open/close status monitoring when checking the sensor, helping you quickly detect unauthorized access.