This carbon dioxide detector can accurately and quickly test indoor carbon dioxide levels to protect . At the same time, it provides real-time monitoring of indoor temperature and humidity. Using infrared technology, it has high measurement accuracy, fast response speed, and a resolution of up to 1ppm. It can accurately detect CO2 in the air, and the measurement range can reach 400-5000ppm. This indoor air carbon dioxide meter has a 4-color LED indicator as an air quality warning. Different colored lights will flash according to the CO2 content, making the air quality more intuitive. The 1200mAh rechargeable battery provides 240-360 minutes of standby time and can be through the Type-C charging port. 2.8-inch LCD screen with backlight display, clear and soft display, clear reading. Portable size, easy to carry around. easy to use. No need to calibrate after power on, automatic work, automatic detection. It can be used in offices, cars, schools, hotels, greenhouse vegetables, production warehouses, raw material processing and other occasions. CO2 Description: 0~799ppm: Green light flashes 800~1199ppm: yellow light flashing 1200~1599ppm: Orange light flashes 1600~1999ppm red light flashing Above 1999ppm, the four-color light flashes Display mode: LED digital display + LCD screen + backlight CO2 detection technology: infrared CO2 measurement range: 400-5000PPM CO2 detection sensitivity: 1PPM Temperature measurement range: 0-50C Temperature measurement accuracy: 1C Humidity measurement range: 0%-99%RH Humidity measurement accuracy: 2%RH Battery capacity: 1200mAh lithium battery Charging port: 5V Type-C port Product size: 9.0 x 7.0 x 3.5cm :ELECTRICAL With LCD Screen Or Not:Yes Gas Type:oxygen color:White Material:ABS Package Contents: 1 x Carbon dioxide detector 1 x USB cable Only the above package content, other products are not included. Note: Light reflection 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.