Mini Air Quality Monitor: Can measure CO2, temperature and humidity at the same time, very suitable for home and office. With backside hole and foldable stand, you can place the air quality monitor on tabletop or hang it on the wall. High Accuracy Sensor: Adopts NDIR infrared sensor to measure CO2, temperature and humidity, which is more accurate, more reliable and more durable than traditional electrochemical sensors. Automatic Alarm System: When the CO2 value exceeds 1000PPM(default), an alarm will be issued automatically, you will hear beep sound, which notify you to keep the indoor environment ventilated in time. Adjustable CO2 Alarm Threshold: The CO2 alarm threshold can be set to 800PPM/900PPM/1000PPM/1100PPM/1200PPM/1300PPM/1400PPM/1500PPM/1600PPM/1700PPM/1800PPM/1900PPM/2000PPM to adapt to different environments and different workplaces. Adjustable Screen Brightness: The screen brightness of the air quality monitor supports 6 levels adjustment, which makes it more suitable for home use. Even if using it at night, it will not affect your sleep. Features: Mini Air Quality Monitor: Can measure CO2, temperature and humidity at the same time, very suitable for home and office. With backside hole and foldable stand, you can place the air quality monitor on tabletop or hang it on the wall. High Accuracy Sensor: Adopts NDIR infrared sensor to measure CO2, temperature and humidity, which is more accurate, more reliable and more durable than traditional electrochemical sensors. Automatic Alarm System: When the CO2 value exceeds 1000PPM(default), an alarm will be issued automatically, you will hear beep sound, which notify you to keep the indoor environment ventilated in time. Adjustable CO2 Alarm Threshold: The CO2 alarm threshold can be set to 800PPM/900PPM/1000PPM/1100PPM/1200PPM/1300PPM/1400PPM/1500PPM/1600PPM/1700PPM/1800PPM/1900PPM/2000PPM to adapt to different environments and different workplaces. Adjustable Screen Brightness: The screen brightness of the air quality monitor supports 6 levels adjustment, which makes it more suitable for home use. Even if using it at night, it will not affect your sleep. Built-in Rechargeable Battery: Built-in 2000mAh large capacity lithium battery that can be recharged by provided USB charging cable, and continuous use can reach more than 24 hour, long working time. Specifications: Material: ABS CO2 technology: infrared (NDIR) Sampling Time: 1.5s Detection CO2: 400-5000ppm Detection Temperature: -10 to 60 Relative Humidity: 20%-85% Power supply: Built-in 2000mAh Lithium Battery Charging: 5V USB Item Size: 9.6 * 3.3cm/ 3.8 * 1.3in Item Weight: 150g/ 5.3oz Packing List: 1 * Air Quality Monitor 1 * USB Charging Cable 1 * Users Manual(English)