Description: Indicator light: When the indicator light value is less than 150 meanwhile the green D2 light turns on, the surrounding environment is relatively healthy. When the indicator light value is greater than 200 less than 400 meanwhile the yellow D1 light turns on, the surrounding environment is moderate pollution. When the indicator light value is greater than 400 less than 700 meanwhile the red D3 light turns on, the surrounding environment is severe pollution. When the indicator light value is greater than 800 meanwhile all light turns on, the surrounding environment is serious pollution. Key: To enter the compensation settings by pressing the button one time,short press plus 1,long press continuous plus 1,Numerical range -50~+50.To automatically exit after a few seconds. PCB size: 67x64x24mm Power supply requirements: 5V DC power supply(Use mini USB power supply) This product uses three digital tube display, show a range of 0-999 . This product has the function of compensation, it can be adjusted according to the use of the surrounding environment. This product uses SHARP optical dust sensor,The sensor has a very low current consumption , it's sensitivity for 0.5V/0.1mg/m3. So, our products have a very high detection accuracy, very reliable. Package List: 1x SainSmart PM2.5 Air Quality Detector
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