It is a high-quality air quality detector, using a superior electrochemical detection module, high precision, stable performance, and can accurately detect carbon dioxide values. screen design, measurement data is clear at a glance. Different colors show different air quality, the first smile face is 400-799ppm, the second smile face is 800-1199ppm, the third smile face is 1200-1599ppm, the fourth smile face is 1600-1999ppm, and the fifth smile face is above 2000ppm. The smart carbon dioxide value tester uses infrared sensors to monitor the temperature and humidity of CO2 gas. The superior electrochemical detection module is adopted, with high precision and stable performance, which can accurately detect the carbon dioxide value. Strong anti-interference ability, low consumption and long service life. Hundreds of ventilation holes on the back of the case not only accelerate the convection between the air and the machine for effective detection, but also provide good heat dissipation. Widely used: agricultural planting, greenhouse vegetables, production warehouse, material processing, , etc. 3 in 1: screen displays power, CO2 value, temperature and humidity. No need to calibrate when booting up, work automatically and detect automatically. Some models of sensors work intermittently. Does not affect the product itself Operation guide 1. Press and hold the "on" button on the back for 3 seconds to turn it on and off to display the current air quality parameters. 2. The screen displays real carbon dioxide data, ambient temperature and humidity data, and the expression will change according to the change of carbon dioxide content. 3. Double-click the switch to switch between Celsius and China degrees. 4. Can be by plugging in a USB-Typec 5V power supply. The battery flashes when charging, and stops when fully . If the display is full but still flashing, it means the charge is not saturated. please wait a moment. 5. This product has its own charging and discharging protection, and supports long-term use of USB power supply. :ELECTRICAL Model Number:2C07 Gas Type:CO2 With LCD Screen Or Not:Yes PM2.5:data is 100,An audible alarm will be triggered CO2 measurement : NDIR infrared sensor CO2 detection range: 400-5000 CO2 detection sensitivity: 1PPM Temperature measurement range: 0~50C Temperature measurement accuracy: 1C Humidity measurement range: 0%~99%RH Humidity measurement accuracy: 5%RH Charging : USB-Type C 5VIA Battery: built-in lithium battery 1200mAh Net weight: about 280g color:Black Material:Metal+ABS Package Contents: 1 x Carbon Dioxide Detector 1 x USB power cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.