Ring Alarm Contact Sensor (2nd Gen) - 2 pack

Make sure your doors and windows are shut.
Alarm Contact Sensor simply connects to your Alarm Base Station and includes a removable slim magnet for easy installation on any door or window frame in your home. Choose to get audio or mobile notifications so you’ll always be the first to know whenever your doors or windows are opened.

Triggers your Alarm if someone tampers with Contact Sensors and system is armed in Away or Home Mode.