10-year sealed, tamper proof lithium battery-powered smoke alarm with built-in radio frequency technology for wireless interconnection. High quality optical sensor for optimal smoke detection, with fewer false alarms. Can be wirelessly interconnected with up to 20 total Hispec RF10-PRO radio frequency fire safety devices, including smoke, heat and CO alarms (when one alram sounds, intercomnected alarms will also trigger). Suitable for use in hallways, landings, living rooms, dining rooms and bedrooms. Interlinked via Wireless 10-Year Sealed Tamperproof Lithium Integrated Battery 85dB Alarm at 3m Test/Hush Button Interconnect up to 20 Wireless Detectors Easy Installation, No Wiring Required Silence Nuisance Alarms Test Button Low Battery Warning Fixings Supplied Interlinked via Wireless 10-Year Sealed Tamperproof Lithium Integrated Battery 85dB Alarm at 3m Test/Hush Button Interconnect up to 20 Wireless Detectors Easy Installation, No Wiring Required Silence Nuisance Alarms Test Butt...