Feature: 1. Multiple Functions: CO2 meter has multiple functions, using an empty semiconductor TVOC sensor, which can detect not only carbon dioxide, but also temperature and humidity. 2. High 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. 3. Good 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. 4. Clear Display: Carbon dioxide detector uses a large screen display, which can clearly see the temperature and humidity values and power, and is highly practical. 5. Small 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. Specification: Item Type: CO2 Monitor Material: PC,ABS Screen Material: LCD Screen Product Size:Approx. 270 x 90 x 35mm / 10.6 x 3.5 x 1.4in Input Voltage: DC5V 1000mA CO2 Test Measurement Range: 400ppm-5000ppm CO2 Test Accuracy: 400-1000ppm, Deviation: ±50ppm Above 1000ppm, Deviation: ±5% CO2 Display Resolution: 1ppm Temperature Measurement Range: -10°C to 50°C Temperature Accuracy: ±1.0°C (0°C to 40°C) Humidity Measurement Range: 20%-85% Humidity Accuracy: ±5% Battery: Lithium Battery 2000mah (shipped with Built in Battery) Charging Method: Type C Charging Cable Weight: Approx. 475g / 16.8oz. Package List: 1 x CO2 Monitor1 x User Manual1 x USB Charging Cable2 x Screw2 x Expansion Tube Note: Ships with built in battery.