This multifunctional air quality detector realizes 3 in 1 function: CO2, temperature and humidity. The combination of infrared ( NDIR) and temperature and humidity sensor technology enables accurate records of CO2, temperature, and humidity. These three indexes will be shown clearly on the digital screen.Features: Detection of 3 indexes, including CO2, temperature, and humidity. The infrared technology realizes the accurate record of the concentration of CO2, ranging from 400 to 5000ppm. Real-time monitoring enables you to know the exact data for each second. All the data will be shown clearly on the digital screen. The 2000amh Li-battery guarantees a long working time. Specifications: Item name:multi-function CO2 air quality detector DM306C Material: metal+ABS Color: black Display method: common screen display Measurement items: CO2, temperature, and humidity CO2 technology: infrared (NDIR) Detection range: CO2( 400-5000 ppm) Battery: 1 * lithium battery 3.7v 2000mAh (included) Power source: USB charging Item size:9*9*5cm Item weight: 225g Package information: Package size: 13*13*9cm Package weight: 360g Package list:1* main unit;1* manual;1*charging cable Box package