Carbon monoxide (CO) is a colorless, odorless, and poisonous gas that can be emitted from household items with incomplete fuel combustion. Common sources include ovens, boilers, BBQs, open fires, and blocked chimneys. CO is deadly, and the only way to be alerted to its presence is with an audible CO alarm. This FireAngel CO alarm features an advanced electrochemical sensor and a pre-alarm warning, utilizing an intelligent algorithm for heightened sensitivity and rapid alerts. It includes a memory function to indicate previous alarm activations and a quiet test function for discreet testing at a lower volume. Advanced diagnostics can be supported via cable, and it offers prominent visual alarm notification. Certified to BS EN 50291-1:2018 and BS EN 50291-2:2019, this alarm is rigorously tested in-house and third-party approved, Kitemark Approved by BSI. It provides a warning for low levels of carbon monoxide and a ventilate alert as levels increase. The large test button allows for a complete alarm test with either a quieter audible alert or a full alert. A sleep-easy feature silences low battery chirps for 8 hours. The alarm has a sealed 10-year battery, offering protection for its lifetime without needing battery changes. Suitable for domestic premises including static and mobile homes, caravans, motor caravans, and boats. It is also suitable for homes in England, Wales, NI, and Scotland. The unit dimensions are H:3.3 x W:12.5 x D:6.7 cm, and it comes with a 5-year guarantee. Model Number: FA3820-EUX10.