This Siren alerts you when events are detected by Swann's range of Wi-Fi Sensors (sold separately). With this Siren you'll always be aware of what's happening in and around your home or business as, once triggered, it lets off a loud alerting sound that's able to be armed, disarmed, and controlled in the Swann Security app with adjustable volume. It also has lights to notify you visually. Use it to be alerted of doorway entries/exits, the movements of people and pets, even water leaks. This Indoor Siren can be integrated into a complete security system managed on the app to receive alerts. Great solution for seniors and hearing impaired. Works with Swann Camera systems, Wi-Fi Alert Sensors and Video Doorbell.