It adopts digital temperature and humidity sensor, which has high precision, stable performance, anti-interference, low power consumption and long service life. LCD screen, you can clearly see the power, CO2 value, TVOC value, HCHO value, temperature and humidity. Celsius and Fahrenheit are switchable, and the alarm sound can be turned on or off according to your needs. Equipped with an environmental quality judgment function that displays corresponding levels based on measured values. Built-in 1800mAh lithium battery, which can be easily charged via USB cable. This is a high-quality air quality detector that uses a professional electrochemical detection module with high accuracy, stable performance, anti-interference, low power consumption and long service life. Accurately detect CO2. With a large screen, you can clearly see the power, CO2 value, TVOC value, HCHO value, temperature and humidity. You can have a try. When the battery is too low, the battery will flash to remind you to charge. Specifications: Name: Air quality meter Display: LCD Battery: 1 x built-in lithium battery, 3.7V, 1800mAh (included) CO2 measuring range: 350ppm-2000ppm TVOC measuring range: 0.000 mg/m and sup3; -2000 mg/ cubic meters and sup3; HCHO measuring range: 0.000mg/m3 and sup3; -1000 mg/m3 and sup3; Temperature measuring range: 0°C - 90.0°C (32°F - 194°F), +/- 1°C/ +/- 1 degree Fahrenheit Craft Supplies: Electric Model: JD-3002 Air Quality Meter Type: CO With or without LCD Screen: Yes Measuring Range: 350ppm-2000ppm Color: Black Material: Plastic Packaging Contents: 1 x Air Quality Tester 1 x USB cable Only the above package contents, other products are not included. Note: Lighting and different monitors may cause the color of the item in the picture to be slightly different from the actual item. The measurement allowance is +/-1-3cm.