Photoelectric sensors, Z18 Simple Sense, ZLD18-BFZ4A8, Communication interface: -, Mounting system type: M18, head/side (24.1 … 25.4 mm), Sensor/ detection principle: Photoelectric retro-reflective sensor, With minimum distance to reflector (dual lens system), Sensing range: 5 m, Light source, light type: LED, visible red light, Switching output Q1: PNP, Dark switching, Switching output Q2: Not connected, Connection type: Male connector M12, 4-pin