This Smoke Detector uses a non-radioactive photo-electron-sensor for a reliable and safe detection of smoke. The smoke sensitivity is 0.5-4 %/ft. The smoke detector has a test button and a flashing led, so you always know that the smoke alarm is working correctly. The smoke alarm will warn you when the battery is low. When the device detects smoke, it will give a loud warning sound. It will also trigger actions in other Z-Wave devices or Z-Wave controllers to escalate the alarm. The Smoke Detector can also activate an alarm-scenario within the Z-Wave network. For example you can create an alarm-scenario to switch on all lights in the house when smoke is detected. Even at the middle of the night, you may leave the house very quickly when smoke is detected.