... 4.Loud 85dB alarm signal Smoke detector GS506 with EN14604 IntroductinSITERWELL GS50X series Stand-alone photoelectric smoke detector(alarm), made of high ... quality optical sensor, conforms to BSI, UL, GS norm. Properly installed and maintained, residential smoke alarms ... CE approval EN14604 certificate More pictureINSTALLATION VdS,LPCB smoke detector GS506