gs508Page 1 Alarm U Smoke User Manu Mode el number: : GS508C fST508C hall lway is more e than 30 fee t long, instal ll a smoke al larm at Thank k you for purc chasing our sm moke alarm. Please take a each h end. Page 2: Operation doThe SafeHome GS508 is a battery operated smoke detector which utilizes a photoelectric sensor. Photoelectric technology allows the detector to be more sensitive to detecting slow smoldering