Features 1、ULN2003 driver board use high power chip for driving stepper motor 2、Increased output expansion interface 3、A, B, C, D four-phase LED indicates the status of the stepper motor work 4、It has a standard interface for plug and play 5、A, B, C, D light-emitting diode instructions four-phase stepper motor work with the state of the standard stepper motor interface, can be used directly plug Specification Features: ULN2003 driver board use high power chip for driving stepper motor Increased output expansion interface. A, B, C, D four-phase LED indicates the status of the stepper motor work. It has a standard interface for plug and play. Specifications: Size: 3.5 x 3.2cm / 1.38 x 1.26in Weight: 6g Package included: 5 x Motor Driver Board Package List