This DYNAPAR E14102400700 1.5" COMPACT ENCODER 1/4" shaft, 5VDC, 18" cable diff biDir is a sensor/switch. It detects a change in state, position, or presence and relays that information to a controller or operator interface. Key specifications noted on this listing include 5VDC. It is commonly in conveyor systems, robotics, and industrial automation equipment.
