The Siren SE812 Siren will warn everybody in the building by a loud sound and a flashing light that an alarm has occurred. This product is especially suited to use in combination with other Z-Wave devices such as sensors. The Siren gives a loud sound and a flashing warning light, so everybody in the building will know immediately that an alarm has occurred. You can choose to activate the siren either by burglary alarm or by any other event in your home. It is even possible to install multiple sirens, so the alarm can be heard loudly at multiple locations.