Ei Electronics Ei650RF Wireless Smoke Detector, Bundle of Wireless Networkable Smoke Alarm and Radio Module Set of 8, Test Winner Stiftung Warentest with Battery for 10 Years, White : Amazon.de: DIY & Tools
Hekatron Genius PLUS Smoke Detector/Fire Alarm with Built-In Battery (10 Year Life), Multi-coloured LEDs & Support App (English Language not Guaranteed), white, 31-500020-06-02 : Amazon.co.uk: DIY & Tools