ITEM NAME:Motor Shield V4 Stepper Driver A3967 For Arduino Red Q4P6 Motor Shield V4 Stepper Driver A3967 For Arduino Red Q4P6 MS1 and MS2 is a logic input for selecting the resolution of the stepper motor subdivision; Dir is the choice of the direction of the opening motor; Resetting the chip to reset the initial value, blocking any external output; Out1a, out1b, out2a, out2b a h bridge two output ports; Activation to activate terminal; SENSE1, Sense2 a h bridge current detection resistor; Ref is a reference voltage; GND logic ground and power mass; material:?plastic The package includes: 1X A3967 Motor Driver Edge (with pins) Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.