Deta 1169 Carbon Monoxide Alarm Mains with 9V Battery Backup\n--Detects dangerous levels of Carbon Monoxide, making it ideal for installation in all rooms with fuel burning appliances\n--9V battery back up with low battery warning, test/silence button, LED operating indicators\n--Sound output 85db at 1m, maximum power consumption 9W\n--Interlinkable up to 12 optical, heat and carbon monoxide alarms in total for larger properties\n--Missing battery indicator and mechanism prevents installation of the alarm if the battery is missing\n--Two-part assembly, allows mounting base to be installed at 2nd fix with alarm head installed later once decorating is complete\n--Supplied with easy fix universal mounting base, providing large wiring space and incorporating a foam gasket to prevent dust ingress. Alarm head is easily connected using a fly lead connection and simply push fits into the base\n--High visibility dust cover protects alarm head from dust ingress during building works\n--BSm