Features: brand new and high quality There are 4 types, black 3 in1, black 5 in 1, white 3 in 1 and white 5 in 1. Intelligent carbon dioxide value tester gas analyzer is an empty semiconductor TVOC sensor, air quality monitoring temperature and humidity. It is a kind of high quality air quality detector, using good quality electrochemical detection module, good accuracy, stable performance, strong anti-interference ability, low consumption, long service life. Accurate detection of CO2. The large screen shows pwoer, CO2, temperature and humidity. The product does not require calibration and can be tested by starting the machine to accurately detect carbon dioxide. Specifications: Material: ABS Size: 90x70x40mm/ 3.54x 2.75x 1.57 in 3 in 1: CO2 ,Temperature , Humidity 5 in 1: CO2, HCHO , TVOC , Temperature , Humidity Package Includes: 1x Air Quality Monitor 1x Cable 1x Manual( (English, Japanese) 1x Box 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.