Wirelessly connect up to 24 Quell wireless smoke alarms on an independent, wireless alarm network (no WIFI internet required)| Sealed-In lithium battery - maintenance and hassle-free with prevention from tampering and removal. The alarm always on, with no battery replacement required for the 10-year life-span of the alarm| Photoelectric sensor an advanced sensor to detect visible particles associated with smouldering fires| Smart Hush™ button temporarily silences nuisance and false alarms| Test/Reset button - tests the alarm circuitry and horn. Resets memory after the alarm has sounded| Talking voice Alarm more effective at waking than a tone only with voice message “Fire”| End-of-life signal - chirps every 30-45 seconds to signal that alarm needs to be replaced| Deactivation switch disables the alarm to allow for safe battery disposal once the unit has reached the end of its 10 year life| 10 year limited warranty. Provides peace-of-mind with a decade of smoke and fire detection| Complies with Australian Standard AS 3786:2014 incl. Amdt 1 and Activfire listed for quality assurance.