Features: Built-in 1200mAh Lithium-battery, charging- 2-3 hours-, can be used for 6 hours-. Adopts advanced and accurate NDIR sensor, accurately and quickly detect temperature, humidity,HCHO,TVOC PM2.5 PM-1.0 PM10-. Automatically adjust the screen display brightness according to the surrounding environment, so that the screen can be seen without dazzling-. When not in use, the screen can be automatically turned off to reduce energy consumption. Suitable for household, kitchen, bedroom, office, school, car, hotel, travel, campings, partys. Specifications: Material: ABS- Item size: 70x84x35mm/2.8x3.3x1.4-inch Package size: 138x107x42mm/5.4-x4.2x1.7-inch Package Includes: 1xAir Quality Monitor 1xManual 1xUSB Cable note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.