Mains-powered smoke alarm with sealed lithium battery. Contains optical multi-sensing Thermoptek technology for rapid detection of all types of fires. Easy to fit and suitable for use in the hallway, landings, living rooms, dining rooms and bedrooms. Can be used as a standalone device or as part of a network via wireless, hardwiring or a mixed system. Create a Smart RF Wireless Interlink network by fitting a Smart RF Module and link to Specification alarms (sold separately). Interlinked via Wireless or when Hardwired (Wireless Module Required) 230V AC Mains-Powered with Battery Backup 10-Year Sealed Tamperproof Lithium Integrated Battery 85dBA Alarm at 3m Test/Hush Button Interlinked via Wireless or when Hardwired (Wireless Module Required) 230V AC Mains-Powered with Battery Backup 10-Year Sealed Tamperproof Lithium Integrated Battery 85dBA Alarm at 3m Test/Hush Button