The Netatmo Smart Smoke Alarm checks itself to make sure it is working. If it finds a problem, it sends a notification to your smartphone.

Netatmo Smart Smoke Detector that alerts you on your smartphone if its alarm goes off. Quickly and wirelessly installed in your landing ceiling and in every bedroom in your house.
Battery standby power: 10 years*.
_{*Life span for typical use. The battery’s life span may vary based on the use of the Smart Smoke Alarm. For further information, please go to: https://netatmo.com/usage/nsd.}