Large Display Screen: </b> This air quality monitor with large display screen allows you to see the detection data more clearly, you can get the results easily. Portable Size: This monitor is small in size and you can use it on your desk without taking up too much space on the desk, also easy to carry. Wide Applications: This CO2 monitor can be used at home, office, computer, hotel and other places. Built-in Multiple Sensors: This air quality monitor uses infrared detection technology, laser detection technology and electrochemical detection technology to show you accurate data. Four-color Alarm: There are four different colors to show the different quality of the monitored air: green means the air quality is good, and the colors from yellow to orange to red mean worse air quality. Temperature Unit Conversion: The temperature units can be switched between Celsius and Fahrenheit, and when the monitoring data exceeds the standard, a sound will be issued to indicate this. Specifications: Material: ABS Color: Black, White (optional) PM2.5 detection ranges: 0-999ug/m PM10 detection ranges: 0-999ug/m HCHO detection ranges: 0-9.999mg/m TVOC detection ranges: 0-9.999mg/m CO detection ranges: 0-1000PPM CO2 detection ranges: 400-5000PPM Charging method: USB interface 500mA Type-c Battery: 1 * lithium battery, 1200mAh (included) Item size: 90 * 70 * 35mm / 3.5 * 2.8 * 1.4in Package size: 118 * 115 * 48mm / 4.6 * 4.5 * 1.9in Package weight: 200g / 7.1ounces