Attach this Sensor to a window or door frame to be notified when there's a disturbance. When the magnetized link between the Sensor and receiver is disrupted it sends you an alert. Use it to monitor doors requiring authorized entry, on a window beyond your line of sight to detect entry, and many more! The Window/Door Sensor can be integrated into a complete security system managed on the Swann Security app to receive alerts. It can even be connected to the Indoor Siren for an audible and visible alarm that's a powerful deterrent for intruders.