Carbon Dioxide Detector: Real-time and accurate monitoring of CO2 concentration, ambient humidity, and temperature with date and time display, and data is updated in real-time every 4 seconds. Independent Solid-State Sensor: To measure CO2, temperature and humidity, large color display, LED digital display, intelligent backlight, soft eye protection, intuitive reading, clearer display, 24-hour real-time monitoring. Long Battery Life: Use 3 AA batteries (need to bring your own) or use the USB TYPE-C data cable interface for power, and the battery life can be up to half a month. Automatic alarm system: when the CO2 concentration exceeds 1,000 ppm, an alarm will go off to warn you to ventilate the indoor environment in time...