Features: Large screen display makes it easier to read data, convenient and intuitive, clear division, pollution level, and easy operation of buttons. Using natural air flow detection technology, more accurate determination of air quality problems. Built-in battery, energy-saving and environmental for protection, long standby for time, 3 hours of charging, continuous use of 180-240 minutes. Air quality monitor is simple in design, light in weight, easy to carry. Suitable for home, car, office, factory and other environment, 24-hour real-time monitoring to protect your and your family's healthy life and safety. Specifications: Material: ABS Size: 12x6.3x2.6cm/4.72x0.25x0.1in Detectable substance: CO, CO2, HCHO, Temperature,Humidity Application technology: natural air flow detection technology Display mode: LED digital display Package Includes: 1X Air Quality Monitor note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.