A photoelectric, 240v (hard wired) smoke alarm with a 9v battery back up. Interconnectable with up to 40 Red smoke alarms and includes a test/hush button and visual indicators. The R240 smoke alarm is approved and certified to meet AS3786:2014 and is fully compliant to meet the Queensland 2022 smoke alarm legislation. Can be wirelessly interconnected with the addition of the Red RF wireless base. This product must be installed by a licensed electrician.