The Shelly Plus Smoke Alarm will initiate a loud sound (>85db) and light alarm when smoke is detected. The device will also immediately notify you if smoke is detected, to ensure you can have the quickest reaction time if you're not home at the time. This smoke alarm can also trigger scenes to occur if the alarm sounds by combining with your other Shelly devices. For example, if smoke is detected, turn on all lights to improve visibility for those in the house still. Due to low power consumption, the Shelly Plus Smoke Alarm has up to 5 years of battery life. It also has no angle limitations and is wire-free, therefore making installation easy.