Multi CO2 Meter Air Quality Monitor Detector 3-in-1 Thermohygrometer Humidity Detect Gas Analyzer Carbon Dioxide Tester Detector Feature 1.Premium Sensor & High Accuracy: Our carbon dioxide detector features high-precision infrared sensor and high accuracy. This carbon dioxide detector can detect and display the temperature and humidity of the environment, carbon dioxide concentration, and can switch between & 8451; and & 8457; to help users know the environment. 2.Alarm Function: When the carbon dioxide value exceeds 1500PPM, this CO2 detector will sound an alarm to remind you to open windows to promote ventilation. If you need to turn off the alarm sound, simply press and hold the + button to turn it off. 3.Clear Display: Square design, large display, different colors mean different air quality, green 0-700ppm, orange 700-1500ppm, red (buzzer sound) 1500-5000ppm. 4.Long Standby Time: Built-in lithium battery 2400mAh, voltage 3.7V, 1-2 hours full charge can be used for 10-12 hours usage time or 18 hours standby time, equipped with USB charging cable, can be used while charging. 5.Easy Installation: This CO2 detector features the back hanging hole design, so it can be hung on the wall for easy viewing and space saving. It is suitable for office, bedroom, hall and other places. Description: Our Air Quality Monitor features with high accuracy to help you know the indoor environment anytime. Specifications: Name: Air Quality Monitor Material: ABS Size: about 98*90*42mm/3.86*3.54*1.65in Net weight: about 231g Temperature: -10& 8451;~40& 8451; Humidity: 0~99%RH Carbon dioxide: 0-5000ppm Manual and automatic calibration function Power cord: Type C to USB Alarm: buzzer + indicator bar to make an alarm Battery level detection: remaining battery display Charging: charging status display Backlit: LCD backlight Packing List: Air Quality Monitor*1 Data Cable*1 Manual*1