Features: Accurately test CO2, HCHO, TVOC, Temperature & Humidity. High precision temperature & humidity sensor detection, real-time display value. temperature : 0-- 40 (32-- 99 F), humidity 20%-- 95% (tolerance +/ -- 5%). 4 colors to display CO2 concentration grade, green-excellent, yellow-normal, orange-bad, red-serious. Exquisite appearance, simple design, light weight, easy to carry. Suitable for household, kitchen, bedroom, office, school, car, hotel, travel, camping, party etc. Specifications: Material: Plastic Size: 9.3x8.3x3.5cm/3.66x3.27x1.38in CO2 Concentration Range : 400-- 6000ppm TVOC Concentration Range: 0---2 mg/m HCHO Concentration Range: 0---1 mg/m Color: Black/Rose Gold/Silver Package Includes: 1x Air Quality Monitor note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.