Feature 1[3 Screen Change] 3 kinds of screens can be changed at will, in the power on state, press the switch button 3 times continuously, you can switch the screen. 2[Sound Alarm] Air quality monitor can alarm when PM2.5 exceeds the limit value, if PM2.5 data is greater than 100ug/m, the sound alarm will be triggered. 3[High Accuracy] Built in high accuracy sensor, accurately grasp the temperature and humidity of the environment, press the power button to convert C and F. 4[High Efficiency] Air convection design, rapid air circulation, more faster, more accurate and more effective detection, so you can use it with confidence. 5[Widely Application] This air quality detector is easy to use, and widely used in many situations, such as homes, offices, bedrooms, etc.Item Type: Air Quality DetectorMaterial: ABSProduct Size: Approx. 9 x 7 x 3.5 cm / 3.5 x 2.8 x 1.4 inBattery: 1 x 3.7V 18650 battery (Battery Not Included)Measuring Range 400-6000ppmMeasurement Objects: PM2.5, PM1.0, PM10, CO2, HCHO, TVOC, temperature humidityMeasurement Accuracy: 1ppmResolution: 50ppmVoltage: 5VFeature: With gravity sensor, three screens can be switchedWeight: Approx. 230g / 8.1oz .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 AirQuality Detector (BatteryNotIncluded)1 x Connecting Line