Features This sensor uses the principle of laser scattering, that is, the laser is irradiated on suspended particles in the air to produce scattering, and at the same time, the scattered light is collected at a specific angle to obtain the curve of the scattered Furthermore, the microprocessor uses an algorithm based on the MIE theories to obtain the equivalent particle size of the particles and the number of particles of different sizes per unit volume. Wide range of applications, users no longer need to design the air duct ultra-thin design, only 12 mm, suitable for portable devices. Six‑sided omnidirectional shielding, strong anti‑interference performance, optional direction of air inlet and outlet. 0 error alarm rate, real‑time response and support for continuous acquisition, minimum resolution particle size 0.3um. Specification: Item Type: PM2.5 Sensor ModuleMaterial: Aluminum alloy Purpose: PM2.5 detection Input Voltage: 5V Working Current: ≤100mA Counting Efficiency: 50% at 0.3um 98% at ≥0.5 um Response Time: ≤10 s Package List:1 x PM2.5 Sensor Module1 x Terminal  Package List 1 x PM2.5 Sensor Module 1 x Terminal