Mains-powered heat alarm with a long-life 9V battery back-up. Suitable for all homes and designed for use to protect the kitchen, garage or loft. Featuring a modern design and enhanced heat sensing technology. Large central test and separate silence button makes regular testing and silencing easy. Enhance home protection by interconnecting up to 12 smoke (SW1 or SW10) and/or heat (HW1 or HW10) units, so, when one sounds, they all sound. Includes a safety clip feature to prevent installation of smoke alarm without back-up battery installed. Can be connected wirelessly when used with a wireless base RF-BW-T (code 408CC). Interlinked when Hardwired 230V AC Mains-Powered with Battery Backup Replaceable Lithium Battery Supplied 85dB Alarm at 3m Test/Hush Button LED Operating Indicators: Power & Fault / Alarm Interlinked when Hardwired 230V AC Mains-Powered with Battery Backup Replaceable Lithium Battery Supplied 85dB Alarm at 3m Test/Hush Button LED Operating Indicators: Power & Fault /...