Builtin alarm alerts you when CO2 levels exceed safe thresholds, prompting immediate ventilation actions and helping you actively manage indoor air quality. Suitable for healthconscious individuals, including families, office workers, and people with respiratory sensitivities, who require a safe and healthy indoor environment. precision digital CO2, temperature, and humidity meter; an essential tool for monitoring indoor air quality with reliable performance. Multifunctional and portable design; this CO2 digital monitor is suitable for use in homes, offices, schools, and vehicles to maintain air conditions. Compact and easy to use, offering practical readings that support timely decisions about ventilation and environmental comfort. Use scenarios: In the home: monitor CO2 levels in living rooms or bedrooms, especially during gatherings or cooking, to determine when to ventilate. In offices or schools: place in meeting rooms or classrooms to help maintain comfortable air quality during activities and teaching or work. In vehicles: use in cars or other vehicles to monitor air quality during commutes or long trips.