Features:A4988 is a complete microstepping motor driver with built-in translator for easy operation.This stepper motor driver lets you to operate bipolar stepper motors in full-, half-, quarter-, eighth-,and sixteenth-step modes, with an output drive capacity of up to 35 V and 2 A.The translator is the key to the easy implementation of the A4988. Simply inputting one pulse on the STEP input drives the motor one microstep.Adjustable current control lets you set the maximum current output with a potentiometer, which lets you use voltages above your stepper motor's rated voltage toachieve higher step rates.A4988 driver board widely used in stepper motors /3D printer/CNC/engraving machines/Supported 3d printers. Package Includes:5pcs x Motor Driver Modules Specifications:Heatsink Size:9 x 9 x 5mm/0.35x0.35x0.20inchesA4988 Size:20 x 15 x 11mm/0.79x0.59x0.43inchesColor:Green,Red note:No retail package.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you