Ajax FireProtect 2 RB (Heat/CO) is a compact wireless combined heat and carbon monoxide detector for residential and light‑commercial installations. It uses two thermistors for heat and rapid temperature‑rise detection plus a chemical CO sensor to detect elevated carbon monoxide. The RB variant uses two replaceable CR123A batteries (preinstalled) and communicates with an Ajax Hub over the Jeweller radio protocol for instant alarm notifications and system‑wide interconnection.

• Combined detection: heat & CO sensors in one unit; CO sensor service life ≈10 years.
• Wireless connectivity: Ajax Jeweller protocol — two‑way encrypted communication and anti‑spoofing.
• Replaceable power: 2 × CR123A (3 V) batteries, preinstalled; typical battery life up to ~7 years depending on configuration.
• Built‑in alerting: ~85 dB siren (measured at ≈3 m); tamper detection and LED status indicators.
• Remote management: configure and test remotely via Ajax apps; front‑panel test button for local checks.
• Interconnection: alarms are relayed across the system within hub polling interval (typically within ~20 seconds).

Important notes & safety

• CO alarm thresholds (typical for Heat/CO variants): 50 ppm ≤90 min; 100 ppm ≤40 min; 300 ppm ≤3 min. Confirm thresholds for your certified SKU/region before publishing.
• Heat alarm: published high‑temperature thresholds vary by variant/region (commonly in the ~57–64 °C range); spike alarm commonly triggers on a rapid rise (greater than ~28 °C within 1 minute). Confirm exact values for your SKU/certification.
• This device supplements but does not replace good household ventilation and CO safety practice. Always follow local regulations and installation guidance. For UL/EN certification differences check the specific SKU documentation.
• For exact dimensions, weight and certification details please confirm the SKU (Ajax publishes several closely related FireProtect 2 variants).