Zeta Battery Operated Smoke Detectors Zeta AlarmsPhotoelectic sensing technology (ZT-ST5 & ZTST5/10)Electronic thermistor sensing technology (ZT-TH5)Easy installation and maintenanceSealed Battery case of the back available (with 10- year Li Battery model)£15.00 Battery Life Choose an option10 Year Life Quantity Add to basket Clear options
