... LCD backlitindicating optimal/moderate/poor ventilation u Two alarm ways: buzzer alarm and backlight colours switch u Provide optional 1xrelay ... gases (VOC) such as ammonia, toluene,formaldehyde and cigarette smoke, alcohol, H2S, and carbon monoxide. So it is ... to volatile gases like ammonia, toluene, formaldehyde, sensitive to cigarette smoke, alcohol, H2S, etc. u Small volume, lower consumption ü ...