زنگ خطر داخلی بیسیم خانه هوشمند

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 a smoke alarm or activate the siren by both alarms. It is even possible to install multiple sirens, so the alarm can be heard loudly at multiple locations.