Now with a more compact design, Ring Alarm Contact Sensor features a removable slim magnet for easy installation on any door or window frame, even when space is limited. With a Ring Alarm Contact Sensor installed you can choose to get audio or mobile notifications whenever a door or window is opened.- New-look Keypad, slimmer Contact Sensor and more discreet Motion Detector- Control it all in the Ring app for whole-home security at your fingertips- Receive real-time notifications when your system is triggered- Choose between three security modes: Home, Away, and Disarmed- Alert others in an emergency with new panic buttons- Easily expand your whole-home protection with additional Contact Sensors, Motion Detectors and Outdoor Siren