The use of red semiconductor laser can achieve a detection distance of up to 60m. Metal shell, sturdy and durable. Multiple external dimensions can be selected from M12, M18 and M30. It has short-circuit protection and power polarity protection functions. A high-precision detection system that can detect small objects. The action and reset time is only less than 1ms. The laser beam has a small emission angle, concentrated beam, and strong beam energy, so it can penetrate harsh environments such as rain, snow, fog, and sandstorms. Excellent anti-interference function can be installed tightly in two sets.