Description 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: ABSCO2 technology: infrared (NDIR)Sampling Time: 1.5sDetection CO2: 400-5000ppmDetection Temperature: -10 to 60Relative Humidity: 20%-85%Power supply: Built-in 2000mAh Lithium BatteryCharging: 5V USBItem Size: 9.6 * 3.3cm/ 3.8 * 1.3inItem Weight: 150g/ 5.3ozPacking List:1 * Air Quality Monitor1 * USB Charging Cable1 * Users Manual(English)