Caution: color: we shlp according to the color of the first picture, in the package: if the quantity is not stated in the description, we will shlp the item according to the quantity and model in the title. Portable digital co2 detector multifunctional formaldehyde tester air quality monitor air analyzer the product is shlpped based on the color or size of the main image of the product page. This product can detect air quality in your surrounding with accurate indoor/outdoor air quality monitoring system, quick response and high accurancy, effectively protect you and your family from the harm of bad air quality. Features: highly accurate indoor and outdoor air quality monitoring system with professional grade detection technology. Large lcd display, convenient for your reading anytime. Suitable for using in the car, living room, house with new furniture and decoration, kitchen, bedroom, office, classroom, outdoor environment, etc. Built-in large capacity lithium battery. High-performance intelligent electrochemical independent sensor, so that the data can be seen as real, slight visual, enough reassurance. No need to stare at the machine value all the time, once the value exceeds the limit, it will immediately sound an alarm. 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. Specifications: color: white material: abs measurement range: co2: 400-5000ppm hcho: 0-500ug/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 packing list: 1 * air quality tester 1 * usb cable 1 * user manual