Frequently asked questions

• What sensor type does Shelly Plus Smoke use?

  It uses a photoelectric (optical) sensor that detects smoke particles via light reflection, especially effective against smouldering fires that smoulder for hours before bursting into flames.
• How loud is the alarm?

  The audible alarm reaches up to 85 dB (measured at 3 m), loud enough to wake sleeping occupants, accompanied by a flashing red LED indicator.
• How long does the battery last and what type is it?

  The device uses a 3 V CR123A battery with up to 5 years of autonomy; the detector's total service life is 10 years.
• Will I get a notification when I am not home?

  Yes. Connected over WiFi 2.4 GHz, Shelly Plus Smoke sends an instant notification to the Shelly app on your phone wherever you are, so you can alert neighbours or the fire service.
• Is it certified to European standards?

  Yes, Shelly Plus Smoke is DIN EN 14604 certified, the European standard for standalone smoke alarms, confirming compliance with safety requirements.
• Can I integrate the detector with other smart home devices?

  Yes. With MQTT, webhooks and local scenes support, it integrates into Home Assistant and can trigger actions on other Shelly devices - lights, ventilation or a siren - even without internet.