Help secure outdoor gates, sheds, guesthouses, and windows with Ring Alarm Outdoor Contact Sensor. Subscribe to Ring Protect, sold separately, to get mobile alerts when your outdoor gate opens, or set the sensor to automatically trigger your Ring Alarm siren when armed in Home or Away mode. With its weather-resistant design, the Ring Alarm Outdoor Contact Sensor can withstand outdoor use in most climates. Easily mount the wireless sensor to your outdoor gates, sheds, storage containers, or windows to get alerts when they open or close. Outdoor Contact Sensor comes with mounting tape and screws for easy installation on most surfaces. Plus, if you’ve enrolled in Professional Monitoring, you can choose to receive a call from the monitoring center when the Outdoor Contact Sensor is triggered and request emergency assistance if needed.