Feature 1Multiple Functions: CO2 meter has multiple functions, using an empty semiconductor TVOC sensor, which can detect not only carbon dioxide, but also temperature and humidity. 2High Accuracy: Infrared CO2 meter adopts a good electrochemical detection module, which has good accuracy, stable performance, strong anti interference ability, low consumption and long service life. 3Good Heat Dissipation: There are hundreds of ventilation holes at the rear of the CO2 Monitor, which not only accelerates the convection between the air and the machine, thereby achieving effective detection, and has a good heat dissipation effect. 4Clear Display: Carbon dioxide detector uses a large screen display, which can clearly see the temperature and humidity values and power, and is highly practical. 5Small Portable: Indoor CO2 meter is compact in structure and light in weight, making it easy to carry and use when going out without taking up too much space.Item Type: CO2 MonitorMaterial: PC,ABSScreen Material: LCD ScreenProduct Size:Approx. 270 x 90 x 35mm / 10.6 x 3.5 x 1.4inInput Voltage: DC5V 1000mACO2 Test Measurement Range: 400ppm-5000ppmCO2 Test Accuracy:400-1000ppm, Deviation: 50ppmAbove 1000ppm, Deviation: 5%CO2 Display Resolution: 1ppmTemperature Measurement Range: -10C to 50CTemperature Accuracy: 1.0C (0C to 40C)Humidity Measurement Range: 20%-85%Humidity Accuracy: 5%Battery: Lithium Battery 2000mah (shipped with Built in Battery)Charging Method: Type C Charging CableWeight: Approx. 475g / 16.8oz .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 xCO2Monitor1 x User Manual1 x USB Charging Cable2 x Screw2 x Expansion TubeNoteShips with built in battery.