eufy Security Entry Sensor, Detects Opened and Closed Doors or Windows, Door Monitoring, Sends Alerts, Triggers Siren, 2-Year Battery Life, Indoor Use Only, Requires HomeBase, 24/7 Monitoring Optional
 
Product Features
  

         
2-year Battery Life: One battery provides 800 days of monitoring.
         
For Doors And Windows: Compact and versatile design fits onto any door or window frame. Requires eufy Security HomeBase.
         
100-decibel Siren: Enable or disable siren protection, which triggers a 100-decibel siren on HomeBase, and sends an alert to your smartphone when forced entry is detected.
         
Optional 24/7 Protection Service: New optional 24/7 professional monitoring service is now available for 24/7 emergency police, fire and medical response when your alarm system is triggered.
         
What's Included: Entry Sensor, CR123A Battery, Magnet, 3 x Mounting Screws, Owner's Manual.