Multifunctional CO2 detector: This 3-in-1 air quality detector can measure carbon dioxide content, ambient temperature and humidity. Environmental comfort reminds users to pay attention to the environment through different colors. USB charging: CO2 detector small and easy to carry, can be charged through the charging port of any mobile device. Real-time monitor: Carbon dioxide detection can be set once per second to quickly measure and obtain a relatively stable reading. Large screen: high-resolution digital color screen, real-time display of air quality parameters, CO2 content, temperature and humidity. Wide application: at home, in the office, in agricultural plantations, in a greenhouse, in a production warehouse, etc.