Features:  Compact in size, lightweight and portable, easy to take out and carry around with you.  Uses high accuracy semiconductor sensors, with stable working performance, can accurately detect gases value in the air.  Real-time detection, automatic refresh data, with multi-use.  Multiple anti-interference design with stable detection performance, anti-interference ability, low consumption and can provides long service time.  Large LCD display with backlight, you can see the electricity quantity, CO2 value, TVOC value, formaldehyde value, temperature, and humidity clearly.  Display the value of carbon dioxide concentration per cubic meter, flashing light shows the quality interval level.  Adopts air convection technology, which can provides more accurate detection results.  Automatic calibration technology, the product does not need calibration, it can be tested after booting, and it can accurately detect carbon dioxide.  Hundreds of ventilation holes reserved on the housing not only accelerate the convection between the air and the machine, thereby realizing effective detection, but also provide a fine heat dissipation effect.  Widely applications: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior, business offices, and etc..    Specifications:  Name: Air Quality Detector   Material: ABS  Color: white, black (optional)  Battery: 1 * built-in lithium battery, 3.7V, 1200mAh (included)  Display: LCD display with backlight  CO2 measuring ranges: 400ppm-5000ppm  Formaldehyde measuring ranges: 0-0.6mg/m³  TVOC measuring ranges: 0-2.0mg/m³  Item size: 71.5 * 91.5 * 36mm / 2.81 * 3.60 * 1.42in  Item weight: 101g / 3.56ounce  Package size: 140 * 98 * 50mm / 5.51 * 3.86 * 1.97in  Package weight: 162g / 5.71ounce    Packing List:  1 * Air Quality Detector  1 * Cable  1 * Guideline