Alarm Security Kit Content: Includes Alarm Base Station, Keypad, Door/Window Contact Sensor, Motion Detector and Alarm Range Extender. Protection for every room: Secure entry points, detect motion, and more, with Alarm Sensors that trigger your Alarm's siren and send you alerts in real time. Stay protected even without internet: With optional Alarm Cellular Backup, continue monitoring your home in the event your system goes offline. Requires a compatible Ring subscription (sold separately) for digital arming/disarming and certain other in-app features. Customer reviews may reference features that require a subscription.