Mixed sensor sorts create full security. Combine optical smoke alarms for residing spots with heat alarms for kitchens, all linked by radio signals for unified fire detection. Most radio-interlinked alarms have A selection of a hundred and fifty meters within an open up Place and nearly fifty meters in buildings. https://www.thesafetycentre.co.uk/blog/ems-wireless-firecell-systems-from-the-safety-centre/