This Stepper Motor Driver Module is upgrade of A4988, simple step and direction control interface, 4-layer, 2 oz copper PCB for improved heat dissipation, six different step resolutions: full-step, half-step, 1/4-step, 1/8-step, 1/16-step, /32-step and djustable control lets you set the maximum output with a potentiometer, which lets you use voltages above your stepper motor's rated voltage to achieve higher step rates. Use to replace the A4988 to upgrade your 3D printer. Features - Brand: UEETEK - Simple step and direction control interface. - Can interface directly with 3.3 V and 5 . - Over-temperature thermal shutdown, over- shutdown, and under-voltage . - Short-to-ground and shorted-load protection. - 4-layer, 2 oz copper PCB for improved heat dissipation. - Exposed solder-able ground pad below the driver IC on the bottom of the PCB - Six different step resolutions: full-step, half-step, 1/4-step, 1/8-step, 1/16-step, /32-step. - Adjustable control lets you set the maximum output with a potentiometer, which lets you use voltages above your stepper motor's rated voltage to achieve higher step rates. - Intelligent chopping control that automatically selects the correct decay mode (fast decay decay). - 45 V maximum supply voltage. - Built-in regulator (no external logic voltage supply needed). - Module size, , and interface match those of our A4988 stepper . Warm Tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you! Package list: 5 x UEETEK Stepper Motor Driver Module 5 x UEETEK Heat Sink