1. Carbon dioxide detector: Real-time and accurate monitoring of carbon dioxide concentration, environmental humidity and temperature, displaying the date and time, with data updated every 4 seconds. 2. Independent semiconductor sensor: Used for measuring carbon dioxide, temperature and humidity. It features a color large screen, LED digital display, intelligent backlight for gentle eye protection, intuitive readings and clearer display, with 24/7 real-time monitoring. 3. Ultra-long battery life: It can be powered by 3 AA batteries (batteries need to be prepared by the user) or a USB TYPE-C data cable, with a battery life of up to half a month. 4. Automatic alarm: When the carbon dioxide concentration exceeds 1000 ppm, an alarm will sound to remind you to ventilate the room in time. 5. Compact design: Small and easy to carry, and can be directly connected to a USB cable for use. 6. Can be placed anywhere: Such as schools, offices, bars and restaurants, homes, cars, etc.