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 display, you can see the electricity quantity, CO2 value, TVOC value, HCHO value, temperature, and humidity clearly. Comes with a plastics carrying box for easy transportation and easy storage, and you can take it to wherever you want. Features: Adopts digital temperature and humidity sensor, high accuracy, stable performance, antijamming ability, low consumption and can provides long service time. Large LCD display, you can see the electricity quantity, CO2 value, TVOC value, HCHO value, temperature, and humidity clearly. and switchable, and the alarm sound can be on or off according to your demands. Equipped with environmental quality judgment function, it will display appropriate level according to measuring value. Built-in 1800mAh capacity lithium battery, easy to recharge it with USB cable. When the battery power is too low, the battery symbol flashes to remind you to recharge it. Comes with a plastics carrying box for easy transportation and easy storage, you can take it to wherever you want. Specifications: Name: Air Quality Meter Material: plastics Display: LCD display Battery: 1 * built-in lithium battery, 3.7V, 1800mAh (included) CO2 measuring-range350ppm-2000ppm TVOC measuring-range0.000 mg/m³-2.000 mg/m³ HCHO measuring-range0.000 mg/m³-1.000 mg/m³ Temperature measuring-range: 0-90.0(32-194), ±1/±1 Item size: 176 * 73 * 29mm / 6.93 * 2.87 * 1.14in Item weight: 222g / 7.83ounce Package size: 195 * 95 * 35mm / 7.68 * 3.74 * 1.38in Package weight: 375g / 13.23ounce Packing List: 1 * Air Quality Meter 1 * USB Cable 1 * Plastics