This is a kind of fine quality air quality detector, which is adopt professional electrochemical sensing module, high accuracy, stable performance, antijamming ability, low consumption and can provides long service time. Accurately detect CO2. Large screen display to shows the electricity quantity, CO2, temperature, and humidity. You can have a try. Features: Compact in size, lightweight and portable, easy to take out and carry around with you. Built-in 3.7V, 2500mAh large capacity lithium battery, easy to charge it with USB cable. Uses professional electrochemical sensing module, high accuracy, stable performance, antijamming ability, low consumption and can provides long service time. This product is do not need to calibrate, power-up to test, accurately detect CO2. Large screen display to shows the electricity quantity, CO2 value, temperature, and humidity. Equipped with large display, different font color shows different air quality, 400-450ppm green, 451-700ppm blue, 701-1000ppm purple, 1001-2000 yellow, 2001-5000ppm red. Hundreds vents on the back, not only speed up the convection between air and machine to get effective detection but also provides fine heat radiation effect. Note: The electrochemical sensing module, it is easy to be interfered by other gases, such as kitchen cooking wine, vinegar, perfume, toilet water, skin care products, and acidic fruits. Specifications: Name: Air Quality Detector Material: ABS Color: white Battery capacity: 3.7V, 2500mAh lithium battery (included) Charge mode: DC5V micro-USB Charge time: 1h Test temperature: -20 to 40 Test humidity: 20-90%RH Corresponding time: 1s Item size: 118 * 61 * 26mm / 4.65 * 2.40 * 1.02in Item weight: 133g / 4.69ounce Package size: 172 * 90 * 36mm / 6.77 * 3.54 * 1.42in Package weight: 228g / 8.04ounce Packing List: 1 * Air Quality Detector 1 * Data Line 1 * Guideline