Features:  - Carbon dioxide detector: Smart carbon dioxide value tester gas analyzer uses air semiconductor TVOC sensor to monitor temperature and humidity of air quality.  - It is a high-quality air quality detector, using a good-quality electrochemical detection module, with good accuracy, stable performance, strong anti-interference ability, low consumption and long service life. Accurately detect carbon dioxide. The large screen displays power, CO2, temperature and humidity.   - Adopt electrochemical detection module of high quality, with good accuracy, stable performance, strong anti-interference ability, low consumption and long life of the cabinet.  - The product does not need calibration, it can be tested after booting, and it can accurately detect carbon dioxide.  -The large screen displays the power, CO2 value, temperature and humidity.  - Equipped with a large screen, different font colors display different air quality.  - Hundreds of ventilation holes at the rear not only accelerate the convection between the air and the machine, thereby realizing effective detection, but also provide a good heat dissipation effect.    Specifications:  Screen size: 2.8 inches;  Screen type: TFT-LCD;  Screen material: glass;  Material: ABS;  Color: black;  Screen resolution: 240 * 240;  Response time: <1s;  Size: 71.2*91.6*36.5mm;  Test temperature range: -10℃ to 70℃;  Humidity test range: 0-99%RH;  power supply;  Working voltage: 5V/1A adapter charging;  Maximum power: charging current 600mA;  3.7V lithium battery power supply;  Battery capacity: 1200mAh;  Battery type: lithium battery;  Charging method: USB;  Charging time: 1 hour;    Precautions for the use of sun detector:  The correct way to use the detector for the first time after the customer receives the product:  3-in-1 startup is generally the highest. The effective time is when the power is completely consumed for the first time, and the startup is restarted. The environment and air are affected by various factors. Please refer to the usage method.    Package Included:  1 * Air quality detector;  1 * Cable;  1 * User Manual