Features: 1. Wide application: This detector is suitable for indoor and outdoor air quality, muti-envornmental air quality  for furniture, decoration, cars, etc. 2. Portable: Small and portable but with great wisdom, compact, lightweight and economical portable PM2.5 detector to escort your healthy environment. 3. Function: laser particle sensor, USB charging, real-time , alarm prompt, automatic shutdown, precise detection. 4. Simple and stylish large LED display mode, with high test accuracy, stable performance, with clear and easy to understand digital display, let you know the current air quality at a glance. 5. Intellgent color change warning: digital damage can be seen at a glance, active reminders are exceeded to protect family health at all times. Green means safety, green means light, and red means serious. Built-in lithium battery and usb rechargeable, charging and using, battery life, not afraid of power failure. 6. This product adopts the large medica l low current laser transmitter, with the small laser emission angle and the relevant energy, the main parameter which ensures the consistency, accuracy and stability of the product testing. 7. This product adopts the temperature and humidity compensation algorithm, which ensures the accuracy of product testing. 8. This product adopts the special and precise air duct design, which ensures the quality of air inlet every 30 seconds is 283ml, ensuring the accuracy and stability of the test. 9. This product adopts low nickel fan, it is very quiet to use. This product will not interfere with life and work. Description: This detector is suitable for indoor and outdoor air quality, muti-envornmental air quality for furniture, decoration, cars, etc. Specifications: Material: ABS Color: black + white Battery: 1 * lithium battery, PM2.5 measuring range: 0-999μg / m3 Resolution ratio: 1ug / m3 Measuring accuracy: 1ug / m3 Operating voltage: 3.7V Working hours: 4 ~ 6 hours Charging time: 3h Charging parameters: 5V / 1A Working environment: -20 ℃ ~ 50 ℃ Flowing range: 0-999L / min Item Size: 57 * 57 * 38mm / 2.2 * 2.2 * 1.5in Packing size: 75 * 75 * 64mm / 3.0 * 3.0 * 2.5in Packing Weight: 98g / 3.5oz Packing Package Included: 1 * Air Quality Detector 1 * User Manual 1 * USB Cable Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2.  not calibrated same, item color displayed in photos may be showing slightly different from real object.