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