Features:  Large Display Screen: This CO2 monitor with a large display screen for you to see the detecting data more clearly, you can get the results easily.  Portable Size: This monitor is small in size and you can use it on your desk without taking up too much desk space, also easy for you to carry.  Screen Brightness Adjustable: The brightness of the screen can be adjusted according to your needs, you can easy reading even in dark environments.  Wide Applications: This CO2 monitor can be used in your home, office, destop, hotel and other places.  Built-in Lithium Battery: This CO2 monitor using built-in large capacity to supplys power, you can recharge it in time.    Specifications:  Material: ABS  Color: black  Temperature measuring ranges: 0~50℃  Error: ±1℃  Humidity measuring ranges: 25%~95%  Error: 5%  CO2 measurement ranges: 400ppm-5000ppm  Battery: 1 * lithium battery, 2000mAh (included)  Item weight: 160g / 5.6ounce  Package size: 114 * 94 * 62mm / 4.5 * 3.7 * 2.4in  Package weight: 195g / 6.9ounce    Packing list:  1 * CO2 Monitor