<p>Carbon Dioxide Detector: Real-time and accurate monitoring of CO2 concentration, ambient humidity and temperature, with date and clock display, and data is updated real-time update every 4 seconds.</p> <p>Independent semiconductor sensor: used 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.</p> <p>Long battery life: use 3 AA batteries (you need to bring your own) or use the interface of USB TYPE-C data cable to power, and the battery life can last up to half a month.</p> <p>Automatic alarm system: when the CO2 concentration exceeds 1000ppm , an alarm will be issued to inform you to keep the indoor environment ventilated in time.</p> <p>Lightweight design: small size, easy to carry, and can be used directly by plugging in the USB cable. Can be placed anywhere: schools, offices, bars and restaurants, homes, cars, etc.</p>