1、Precision laser sensor detection - Advanced laser sensor detection technology accurately detects PM5 in the air and converts it into a digital display, to display different health level warnings in different colors. 2、More accurate results - Laser scanning detection of PM5 results in more stable and accurate detection than infrared sensors. 3、Rechargeable - Built-in rechargeable battery, 1200mAh large capacity, support 4-6 hours of continuous operation. 4、Multi-purpose - 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、Small and exquisite - The volume is only 7 cubic inches, easy to carry, and can be carried at will. Features: Precision laser sensor detection - Advanced laser sensor detection technology accurately detects PM 2.5 in the air and converts it into a digital display, to display different health level warnings in different colors. Suitable for daily air quality monitoring. More accurate results - Laser scanning detection of PM 2.5 results in more stable and accurate detection than infrared sensors. Rechargeable - Built-in rechargeable battery, 1200mAh large capacity, support 4-6 hours of continuous operation. Small and exquisite - The volume is only 7 cubic inches, easy to carry, and can be carried at will. Multi-purpose - It is suitable for a variety of occasions such as office, home, garden, car, etc., to keep abreast of the air quality around you. Specification: Display mode: LED display Built-in battery: 1200 mAh Humidity range: 20%  -85%. Temporary working temperature: -20 - 50℃ Product specifications: Approx. 2.2 * 2.2 * 1.4 inches Product weight: Approx. 0.22 pounds Package list: 1 * PM 2.5 Detector 1 * User Manual Note: 1. Please allow slight error due to manual measurement. 2. Different monitor colors may be different. Thanks for your kind understanding.