This is a of emission and reception in one photoelectric sensor.Detection distance can be adjusted according to requirements.The sensor has a detection range, interference by visible light small, easy to , easy to use and so on.Can be widely used in robot obstacle avoidance, assembly line and many other automated products.Photoelectric sensor (photoelectric switch) NPN normally open.Colour:As shownMaterial:Plastic + MetalPackage Contents:3 * E18-D80NK Infrared Photoelectric Switch Obstacle Avoidance Sensor ModuleOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.