Siterwell GS50X series Stand-alone photoelectric smoke detector(alarm), made of high quality optical sensor, conforms to BSI, UL, VDS, BOSEC, LPCBGS norm.  Properly installed and maintained, residential smoke alarms (detector) are one of the best and least expensive ways to provide an early warning when a fire begins. Smoke alarms , other name is Rauchmelder, d?ecteur de fum?, rookmelder,r? ykvarsleren , control panel smoke detector, smoke detector alarm, 9v smoke detector, diy alarm, VDS smoke detector, NF smoke detector, LPCB  smoke detector, DC smoke detector, EN14604 smoke detector, alarm , alarm system, detector, fire alarm, fire detector, wireless smoke detector, wireless smoke alarm, personal detector, home alarm, save lives, prevent injuries and minimize property damage by alerting resident early to a fire hazard.