Features: 1. Highly accurate indoor and outdoor air quality monitoring system with professional grade detection technology. 2. Large LCD display, convenient for your reading anytime. Built-in large capacity lithium battery. 3. Suitable for using in the car, living room, house with new furniture and decoration, kitchen, bedroom, office, classroom, outdoor environment, etc. 4. High-performance intelligent electrochemical independent sensor, so that the data can be seen as real, slight visual, enough reassurance. 5. No need to stare at the machine value all the time, once the value exceeds the limit, it will immediately an alarm. 6. You can use double-sided sticker to stick the product on the wall, or install the product by first installing pegs on the wall and then hanging the product on the pegs.   Description: It is suitable for using in the car, living room, house with new furniture and decoration, kitchen, bedroom, office, classroom, outdoor environment, etc. Specifications: Color: white Material: ABS Measurement range: CO2: 400-5000ppm PM2.5: 0-999ug/m3 Battery: 3.7V, 1200mAh Item size: 143 * 109 * 29mm / 5.6 * 4.3 * 1.1in Item weight: 200g / 7.1ounce Package size: 200 * 110 * 50mm / 7.9 * 4.3 * 2.0in Package weight: 300g / 10.6ounce Package Included: 1 * Air Quality Tester 1 * USB Cable 1 * User Manual Notes: 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.