Features [Temperature Humidity Detector] This air quality tester is also equipped with sensor to detect temperature and humidity, making it a good companion for home life. [Air Quality Monitor] Monitor and analyze the air quality in your surroundings with this air quality monitor, which measures levels of HCHO, TVOC, and CO2 to ensure a healthier and safer environment. [High Accuracy] Convective air is formed by openings on both sides and back of the detector, making real time convective detection more accurate. [USB Rechargeable] This portable CO2 monitor can be conveniently charged through a USB cable, features a built in battery with a capacity of 1200mAh, allowing for long lasting use. [LCD Display] The LCD TFT color screen of this air quality detector provides clear and easy to read readings, allowing you to quickly assess the air quality. Specification: Item Type: Air Quality Monitor Material: ABS Display Mode: LCD TFT Color Screen Digital Display Operating Voltage: 5V HCHO: 0-9.999mg/m3 TVOC: 0-9.999mg/m3 CO2: 400-5000ppm Temperature: 0-50℃ Humidity: 0-99%RH Battery Capacity: 1200mAh Polymer Lithium Battery x 1 (Built in) Charging Method: USB 500mA Type C Interface Charging Time: About 4h CO2TVOCHCHO400-600 Excellent (Qualified)0-0.5 Excellent (Qualified)0-0.04 Excellent (Qualified)601-800 Good (Qualified)0.501-0.6 Good (Qualified)0.041-0.08 Good(Qualified)801-1200 Slight Pollution0.601-1.5 Slight Pollution0.081-0.1 Slight Pollution1201-1800 Moderate Pollution1.501-3 Moderate Pollution0.101-0.5 Moderate Pollution1801-3000 Severe Pollution3.001-6 Severe Pollution0.501-1.0 Severe Pollution3001-5000 Serious Pollution6.001-12 Serious Pollution1.001-1.999 Serious Pollution Package List: 1 x Air Quality Monitor 1 x USB Cable 1 x User Manual Note: HCHO ranges from 0.000 to 1.999mg/m³, exceeding 0.08mg will have serious effects on the body; Volatile organic compounds 0.000‑9.999mg/m³. Package List 1 x Air Quality Monitor 1 x USB Cable 1 x User Manual