Description: A, B, C, D four-phase LED indicates the status of the stepper motor work. Stepper motor with a standard interface, when used directly pluggable. ULN2003 Darlington using high-power stepper motor driver chip Size: Approx. 12x4x3mm / 0.47x0.16x0.12inch Color: Blue Package Includes: 1 Piece of ULN2003 Drive Test Module Board