LS-S50ML is a laser sensor that can be taught to recognize difference in colors. It is a class 1 red laser with switching frequency of 1. 5KHZ. Contained in a metal housing with 6ft of cable, which can be utilized for different operations including stroboscopes, counters and panel tachometers. It includes a trimmer potentiometer that is located on the side for minimum and optimum sensitivity adjustments. Can be used in normally closed or normally open operation, NPN type of output, with a yellow LED for signal indication and a green LED for power.