This product is an air quality monitor that detects carbon dioxide (CO2), temperature and humidity. feature: This carbon dioxide detector can accurately and quickly detect indoor carbon dioxide levels to protect your health. In addition, real-time monitoring of indoor temperature and humidity is provided. Using infrared technology, the measurement accuracy is high, the response speed is fast, the resolution can reach 1ppm, and the CO2 in the air can be accurately detected, and the measurement value 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 carbon dioxide level, making the air quality more intuitive. Portable size, easy to carry. easy to use. No need to calibrate after power on, it works and detects automatically. It can be used in offices, homes, cars, schools, hotels, greenhouse vegetables, production warehouses, 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 Specification: Product color: white Material: ABS Display mode: LED digital display + LCD screen + backlight Air Quality Monitor CO2 Air Detector Carbon Dioxide Detector Temperature Humidity Sensor Real Time Readings Note: The data are all measured manually, please allow 1-3cm error. Due to the difference in light and display, there will be a certain color difference, which is subject to the actual product received. Shipping Quantity: 1 piece (subject to the main picture)