Cover the entry points that matter most. Safeguard doors, windows, and more with protection that works where others can’t. Ring Sensors are built to break free from traditional systems with no need for hubs or the limited reach of WiFi. On Amazon Sidewalk, these devices stay connected for reliable protection day and night.1 Add more devices anytime to expand your coverage as your home security needs grow. | Ring | | Window-Door Sensor Instant notifications on Amazon Sidewalk, no base station needed, Pro Monito sold separately 6pk | White | Best Buy