Portable 6 in 1 Air Quality Monitor CO2 HCHO TVOC PM2 5 PM10 CO Level Control
Co2 indication: 0~799ppm: green flashing;1200~1599ppm: orange flashing; 800~1199ppm: yellow flashing; 1600~1999ppm red flashing, and above 1999ppm, four colors flashing. 1 X Air Quality Detector. Built-in lithium battery: 1200mAh.