Detection of CO and NO2 (in the same loop) using a low cost electrochemical sensor, with a useful lifetime of up to 5 years (CO) and 3 years (NO2) and great performance. Specially designed to protect underground car parks, workshops and garages. Available in MINI version for 16 detectors and in an expandable version from 1 to 4 module lines and up to 64 detectors.