Description Key Features: Heat detection only AC-powered with backup battery for continuous operation Instant alerts via the Ajax hub and app Built-in siren provides loud, on-site fire alarms Tamper protection against unauthorised removal Works seamlessly with Ajax security and automation scenarios Self-testing & monitoring for reliable performance Discreet, modern design that fits any interior Two types of interconnected fire alarm; Primary: via an Ajax hub, an alarm in 20 seconds. Fallback: detector to detector, an alarm within 60 seconds