Many Uses! Burglar alarm, panic alarm, intrusion siren, trespassing and theft deterrent – activate the siren manually from the app and/or by motion detection or other automations (using the convenient free YoLink app) Wireless & Flexible! Self-powered and wireless controller, just install the siren and controller wherever it is needed. No additional wires needed! Or, install the Controller connected to existing wiring, with the siren installed outside. (Both are outdoor-rated, but installing the Controller in plastic junction box or enclosure to protect wiring from elements, etc, is recommended)