[Backlit Display] The indoor air quality meter features an LCD screen with backlighting for clear visibility and easy reading, making it user-friendly and ideal for continuous monitoring. [Efficient Air Convection] Thanks to ventilation openings on the sides and back, this air quality tester ensures reliable air circulation, improving the accuracy of real-time measurements. [Durable Material] Made of ABS plastic, this air quality meter is durable, lightweight, and long-lasting – perfect for reliable performance in any environment. [USB Charging] This indoor CO2 meter has USB charging capability for up to 24 hours of continuous operation, so you don't have to worry about batteries. [Precision Measurement Technology] With the combination of semiconductor, infrared, and electrochemical detection, this air meter measures CO2, TVOC, HCHO (formaldehyde), PM2.5, and PM10 with high accuracy.