The Ring Alarm Motion Detector expands your Ring Alarm Kit and adds an extra layer of security to your home. When your Ring Alarm system is armed, the Motion Detector sends instant alerts to your phone and tablet whenever motion is detected at home. The Motion Detector is a simple addition to your Ring Alarm Kit that installs in minutes. Simply place your Motion Detector in a corner of any room in your home, connect it to your Ring Alarm Base Station, and you're all set up! Requires the Ring Alarm Security Kit. Set of two