This is an M3 LTD-03NO 30MM Laser Micro Diffuse Reflectance Photoelectric Switch Laser Visible Light. The photoelectric switch uses the object to block or reflect the beam and detects the presence or absence of the object through the synchronous loop gate circuit. All objects can reflect light and can be detected. A new generation of optical switching equipment with delay, expansion, external synchronization, anti-interference, high reliability, dedicated to self-diagnosis of regional stability and intelligent features.