VOC monitor 1 xon/off output to control a ventilator Three-color backlit LCD and buzzer alarm Temp. and humidity detection Gas detectionHighly sensitive to many harmful gases, such as harmful gases from construction and decoration materials, VOCs (like toluene and formaldehyde); Cigarette smoke; Ammonia and H2S and other gases from household wastes; CO, SO2 from cooking and burning; Alcohol, ...