Feature 1[Alarm Mode] You can manually set the alarm mode, press and hold the power button on the right for 1 second to turn on and off the sound alarm, if the PM2.5 data is greater than 100, the sound alarm will be triggered. 2[Multifunctional] Using far infrared air sensor, it can more accurately measure the eight parameters of CO2, temperature, humidity, PM2.5, PM1.0, PM10, HCHO, TVOC. 3[Good Heat Dissipation] Sufficient ventilation holes not only accelerate the convection between the air and the machine for effective detection, but also provide good heat dissipation. 4[Data Color Change Alert] There are 4 different colors corresponding to different levels. PM2.5, 050, green. 51100, yellow. 101150, orange. Over 151, red. CO2, 400800, green. 8011200, yellow. 12011800, orange. over 1801, red 5[With Gravity Sensor] With a gravity device, it can be viewed both horizontally and vertically. Press the power button three times in a row to switch to 8 parameter mode to meet your different needs.Item Type: Air Quality MonitorMaterial: ABSProduct Size: Approx. 90 x 70 x 35 mm / 3.5 x 2.8 x 1.4 inMaterial: ABSWorking Voltage: 5VMaximum Power Charging Current: 500mACO2 Detection Range: 400-6000PPMTVOC Detection Range: 0-2.0 mg/mHCHO Detection Range: 0-0.6 mg/mPM2.5 Detection Range: 0-1000 UG /mPM2.5 Detection Sensitivity: 1 UG /mPM1.0 Detection Range: 0-1000 UG /mPM10 Detection Range: 0-1000 UG /mTEMP Measurement Range: -10~50Temperature Measurement Accuracy: 2Humidity Measurement Range: 0%~99%RHHumidity Measurement Accuracy: 3%RHBattery Type: 1 x 18650 lithium battery (Battery Not Included)Charging Time: 4hFully Charged Working Time: 8h (approximately)Charging Method: USB chargingApplication: Home, restaurants, educational institutions, fitness clubs, schools, librariesWeight: Approx. 188g / 6.6oz .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x AirQualityMonitor(Battery Not Included)1 x USB Charging Cable1 x Japanese And English ManualNoteTake out the box for the first time, in order to read accurate data, read the data half an hour after the power is turned on, plug it into the USB for charging after booting. Test data will be more accurate after 24 hours