Blended sensor varieties make complete safety. Blend optical smoke alarms for living places with warmth alarms for kitchens, all related via radio indicators for unified fire detection. Up to 126 wireless addresses on just one loop, with enlargement working with extra panels over a wireless community Some RF smoke alarms https://www.thesafetycentre.co.uk/blog/ems-wireless-firecell-systems-from-the-safety-centre/