1、Laser scanning detection of PM5 results in more stable and accurate detection than infrared sensors. 2、Built-in 1200mAH lithium battery, can charge by connecting to the external phone charger. 3、Made of aluminum alloy material, surface adopts anode and highlight treatment, has high-end appearance. 4、It is suitable for a variety of occasions such as office, home, garden, car, etc., to keep abreast of the air quality around you. 5、Compact size and lightweight, easy to carry, and can be carried at will. 6、Special and accurate air duct design is adopted to ensure the air intake volume of 283ml every 30 seconds to ensure the accuracy and stability of the detection. 1 x PM2.5 Detector1 x Chinese Manual1 x USB Cable Condition: 100% Brand NewItem Type: PM 2.5 DetectorMaterial: Aluminium AlloyColor: Luxury Gold ColorSize: Approx.6x6x6cm/ 2.4x 2.4x 2.4inWeight: Approx.233g/ 8.2ozPower Supply: DC5V (USB)Battery: Built-in lithium battery 1200mAhDetection Index: PM 2.5 (ug/m³)Detection Principle: light scattering method (laser detection)Operation Guide: The product adopts the touch switch, touch 2 seconds to turn on, touch again for 2 seconds to turn off; red light is always on, charging is in progress; red light turns green and charging is completed.