Using a laser-Particulate Sensor Higher accuracy than infrared sensorsCome with a fan to increase air flow andxpand detection range 10 Inch Screen To Display Clearly ;plug in usb Real-time refresh per second with NDIR Technology , more accurate air quality grade It also detects and air pollution in bedrooms, kitchens, offices, schools, , cellars, grow rooms, camping, parties and other , always protecting you and your family in healthy air conditions. Material: ABS colour: white Package Contents: 1 x Air Quality Monitor set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.