Features: The sensor uses the principle of laser- scattering to collect data, and uses the algorithm based on the Mie- (MIE-) for theory through the microprocessor to obtain the equivalent particle size of the particles and the number of particles with different particle sizes per unit volume. 8pin 1.25mm pitch interface, each sensor is distributed with an 8pin cable. The fan is powered by 5V, the serial port outputs 3.3VTTL level, and the connection pins pin1, 2, 4, and 5 can work normally. The pins pin3 and pin6 are used for command control and reset. Ultra-thin design, thickness 12mm. Working temperature -5-50℃Working humidity 0-99%Supply voltage 5VMaximum current 100mAData interface level 3.3V Specifications: Material:Metal Size:Approx.4.8x4x1.2cm/1.88x1.57x0.47inches Package Includes: 1x Particulate Sensor note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.