Wireless multi-sensor fire detector that monitors three independent threats simultaneously — smoke, abnormal heat, and carbon monoxide — and triggers a built-in 85 dB siren the moment any threshold is crossed. FireProtect 2 RB combines a photoelectric smoke chamber, a thermal rate-of-rise sensor, and an electrochemical CO cell, catching fires at the smoldering stage (smoke), the flaming stage (heat spike), and the silent stage (CO from incomplete combustion or blocked flues) — three phases that single-purpose alarms miss. When linked through Ajax’s wireless interconnect, a trigger on any one detector sounds the siren on every detector in the system, giving full-property warning regardless of where the threat starts. It pairs with the Ajax Hub 2 over the encrypted Jeweller radio protocol at distances up to 1,300m line-of-sight, runs up to 4 years on two replaceable CR123A batteries (RB = Replaceable Batteries), with self-diagnostics, tamper protection, and a 10-year detector service life. EN 14604 and EN 50291 compliant, mounted on the ceiling with the supplied bracket. Ideal for bedrooms, kitchens, living rooms, hotel guest rooms, offices, and any space where gas appliances, generators, or wood-burning equipment add CO risk alongside fire.