Conveniently press the Hush Button to stop any Fake alerts; the detector routinely recovers to All set method soon after dispersal of smoke and/or heat The panel is always on to look at the position of the program and will warn of very low battery, device failure or RF interference. https://www.thesafetycentre.co.uk/blog/ems-wireless-firecell-systems-from-the-safety-centre/