Features advanced electrochemical sensor and multi function display. Low level monitoring with unique pre alarm and ventilate warning. Memory function, LED intensity reduces at nighttime. Advanced diagnostics support via cable. Multi function display provides visual user instructions. LCD illuminates and colour varies depending on event type. Intelligent sensing algorithm, increases sensing rate on detection of low level CO. Silence function for low battery alerts extended until the next morning. Environmental monitoring - temperature and humidity warning alarm, providing warning for prolonged dangerous environmental conditions. Quiet test function supports discreet testing at a lower volume when compared to standard CO alarms. Certified to BS EN 50291-1:2018 and BS EN 50291-2:2019. Carbon monoxide, or CO, is a poisonous gas emitted from household items that are defective, and as a result are burning fuel incompletely. Common sources of CO include ovens, boilers, BBQ's, open and solid fuel fires, gas or paraffin heaters and blocked or broken chimneys and flues. Carbon monoxide cannot be smelt, tasted or seen, and can be deadly - the only way to be alerted to CO is with an audible CO alarm.