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/m³, 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. Specification: Item Type: Air Quality Detector Material: ABS Product Size: Approx. 9 x 7 x 3.5 cm / 3.5 x 2.8 x 1.4 in Battery: 1 x 3.7V 18650 battery (Battery Not Included) Measuring Range 400-6000ppm Measurement Objects: PM2.5, PM1.0, PM10, CO2, HCHO, TVOC, temperature humidity Measurement Accuracy: 1ppm Resolution: 50ppm Voltage: 5V Feature: With gravity sensor, three screens can be switched Weight: Approx. 230g / 8.1oz. Package List: 1 x Air Quality Detector (Battery Not Included)1 x Connecting Line