Feature: 1. Multiple Functions: This air quality detector adopts semiconductor, infrared, and electrochemical detection technologies, providing comprehensive testing functions for CO2, TVOC, HCHO, PM2.5, and PM10 2. Built in Battery: Featuring a built in 1200mAh rechargeable battery, this air quality detector can operate continuously for 300-360 minutes. With a Type C charging port, it is conveniently rechargeable via USB power sources 3. Easy Reading: The household air quality tester comes with a 2.8 inch HD LCD display screen, displaying real time data for 9 data points, with different colors indicating the air quality status, making it easy to read 4. Accurate Detection: Designed with openings on both sides and the back, this air quality detector ensures more accurate real time detection through convective airflow, making it suitable for more scenes and locations 5. Sturdy and Portable: Made of sturdy ABS material, this air quality detector housing is robust, wear resisting, and long lasting. Its lightweight and portable design makes it suitable for use in any environment Specification: Item Type: Air Quality Detector Display: LCD Color Screen Digital Display Working Voltage: 3.7V Charging Method: DC 5V 500mA Type C USB Sensor: PM2.5 Infrared Sensor, Semiconductor Sensor Battery: 1 x 3.7V Rechargeable Li Battery 1200mAh (Built in) Product Size: 90 x 70 x 35mm / 3.5 x 2.8 x 1.4in Product Weight: Approx. 130g / 4.6oz Charging Time: 4 hours Standby Time: About 300-360 minutes PM2.5: 0-999ug/m³ PM10: 0-999ug/m³ HCHO: 0-9.999mg/m³ TVOC: 0-9.999mg/m³ CO2: 400-5000PPM. Package List: 1 x Air Quality Detector1 x USB Cable1 x User Manual