1. Accurate and Reliable: laser detection, stable, good consistency; 2. Quick response: response time is less than 10 seconds when the scene changes; 3. Easy integration: UART output (or IO output can be customized), fan built-in; 4. High resolution: resolution of 0.3g/m. Scope of application Detector of PM2.5;Purifier. Working principle Using laser scattering principle: Light scattering can be induced when particles go through the detecting area. The scattered light is transformed into electrical signals and these signals be amplified and processed. The number and diameter of particles can be obtained by analysis because the signal waveform has certain relations with the particles diameter. Colour:As Shown Material:PC Package Contents: 1 x Sensor Kit(Due to different product batches, the appearance , which does not affect the use) 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.