The First Alert hearing impaired LED strobe light features an incredibly bright LED strobe that's proven to be extremely efficient in providing assistance for individuals with hearing impairments. The intuitive use of a smart strobe feature carries the ability to distinguish between smoke/heat and Co dangers. First Alert Smart strobe lights include a wide compatibility range and can be interconnected with First Alert and BRK smoke, Co, smoke/Co combination and heat models (up to 18 devices).