The carbon dioxide detector effectively detects the concentration of CO2 in the environment you live in. With LCD screen, it displays carbon dioxide, battery level, temperature and humidity. With precise sensor and alarm function, it can be widely used in home, classroom, hotel room, apartment, office, gym and more! Features: 1.Air Quality Monitor: The carbon dioxide tester can detect the concentration of carbon dioxide in the air, it can be widely used in home, classroom, hotel room, apartment, office, gym, etc. 3.Precise Sensor: Adopts the detection principle of the NDIR sensor, air convection detection, quickly and accurately detect CO2 in the living environment. 4.Alarm Buzzer: When the CO2 concentration is over 1000ppm, the buzzer will beep to remind you, long press the power button to stop it. 5.LCD Display: Displays carbon dioxide, battery level, temperature and temperature. 'humidity. With large LCD screen, clear to read even in dark environment. With stable base, easy to place on the desk.