Fireangel 10 Year Optical Smoke Alarm Twin Pack | Robert Dyas
FireAngel FA3313-SB1-T2 Optical Smoke Alarm + CO Alarm with 1 Year Replaceable Batteries – Twin Pack | Wickes.co.uk
Manutan Twin Optical Smoke and Carbon Monoxide Alarm Set Contains 1 x CO Alarm, 2 x Optical smoke alarm. Gas Detection Monitors Fixed | Fisher Scientific