Description Description Equipped with large screen, different source colors display different air quality, 400-450ppm green, 451-700ppm blue, 701-1000ppm purple, 1001-2000 yellow, 2001-5000ppm red. Uses professional electrochemical detection module, high precision, stable performance, anti-loopback capability, low Wer consumption, and can provide extended service time. Compact iSIZE, ligWeight and portable, easy to take and take with you. Built-in 3.7V, 2500mAh large capacity lithium battery, easy to charge with USB cable. Hundreds of rear vents not only accelerate the convection bWeen the air and the machine for efficient detection, but also produce a fine heat radiating effect. Product description Compact iSIZE, ligWeight and portable, easy to take out and carry. Built-in 3.7V, 2500mAh large capacity lithium battery, easy to charge with USB cable. Uses professional electrochemical detection module, high precision, stable performance, anti-jam ability, low consumption, and can provide long service time. This product does not need to calibrate and turn on to test, detect CO2 accurately. Large screen to display the amount of electricity, CO2 value, temperature and humidity. Equipped with large screen, different source colors show different air quality, 400-450ppm green, 451-700ppm blue, 701-1000ppm purple, 1001-2000 yellow, 2001-5000ppm red. Hundreds of rear vents not only accelerate the convection bWeen air and machine to achieve effective detection, but also for fine heat radiating effect. Note: The electrochemical sensing module is easy to interfere with other gases like cooking wine, vinegar, perfume, cologne, skin care products, and sour fruits. SpeciCATions: Name: air quality detector. Battery capacity: 3.7V, 2500mAh lithium battery (included). Charging mode: 5 V DC micro-USB. Charging time: 1 hour. Test temperature: -20 to 40 . Humidity test: 20-90% RH. Corresponding time: 1 s. IteSIZE: 118 x 61 x 26 mm. IteWeight: 133 g. Package contents: 1 air quality detector. 1 data line. 1 guide (French not guaranteed).