The Ajax FireProtect Plus in black is a wireless indoor fire detector designed to keep your home safe by monitoring for smoke, carbon monoxide, and heat. It combines a photoelectric smoke sensor with a CO sensor and a temperature sensor that triggers an alarm if the heat reaches +59°C. When a threat is detected, the device alerts you immediately with an 85 dB siren and a red glowing logo, sending the signal in just 0.15 seconds. This compact device, measuring 132 × 132 × 31 mm and weighing 220 g, uses the secure Jeweller radio protocol to communicate with your hub from up to 1300 meters away in open spaces. It can operate as a standalone unit or as part of a larger system, where it can trigger a synchronous alarm to activate all other fire detectors in the building. For long-term reliability, it runs on two CR2 batteries with a backup CR2032 cell, providing up to 4 years of power. Installation is straightforward on the ceiling using the included SmartBracket mount. To ensure the device remains effective, it features a dust removal indicator and allows for remote testing of the detection zone and communication quality. The built-in tamper protection adds an extra layer of security, making it a dependable choice for anyone looking to integrate professional-grade fire monitoring into their living space.