Expand your Ring Alarm security system with this set of two contact sensors. Simply mount to doors or window frames and receive instant alerts on your phone or tablet whenever they open. From Ring.
- Includes two contact sensors with installed 3V lithium batteries
- Mounts to door and window frames
- Compatible with free Ring app available on iOS, Android, and Windows 10 smartphones and tablets
- Each measures 3.23" x 0.98" x 0.94"