Features:  Advanced technology of Laser Sensor Detection, detect PM2.5 in Air and transform into digital display accurately, show different healthy level warning in different color. Excellent for daily air quality monitoring.  Detect PM2.5 by laser scanning, giving results more stable and accurate than infrared sensor detection.  Mini size of only 7.3 x 4.5 x 5.5cm, easy to carry and can be put on anywhere you need.  Applicable for many occasions, office, home, garden, in-car, etc. Keep track of the air quality around you.     Specification:  Size: 7.3 x 4.5 x 5.5cm/2.9 x 1.8 x 2.2inch;  Color: Black/White;  Principle of detection: Light scattering;  Detection range: 1-500 μg/m³;  Resolution ratio: 1 μg/m³;  Detection range Temp.: 0~50℃;  Resolution ratio Temp: 1℃;  Precision Temp: ±2℃;  Detection range Humidity: 20~90%RH;  Resolution ratio Humidity: 1%RH;  Precision: ±4%RH;  Power Connector: Micro USB;  Working Temperature: 0~50℃;  Working Voltage: 4.75~5.25V;  Working Current: 200mA;  Function: PM2.5/Temperature/Humidity Monitor.     Package included:  1 x Air Quality Monitor;  1 x USB.