and high quality. Suitable for Genius Pro/SW-X2/Hornet 3D printer used. Ultra-quiet operation, good heat dissipation Low-speed silent, high-speed anti-shake Two-color pin header, stable performance Large area heat dissipation, lower temperature. The driver is equipped with a heat sink to assist the driver to dissipate heat and increase the heat dissipation area. The heat of the driver chip can be quickly discharged through the heat sink, which greatly reduces the temperature of the driver during operation, which is beneficial to the normal operation of the printer and prevents steps and stops working. 1. Hardware compatible with StepStick and Pololu A4988 2. Drive capability up to 2.5A 3. Step/Dir interface with microstep interpolation (up to 256 microsteps) 4. Motor voltage:4.75V-32V 5. Logic voltage: 3.3V and 5V Precautions for use: 1. Please pay special attention to the drive direction, do not insert it backwards! 2. When measuring voltage, be sure not to connect the motor, otherwise it is easy to burn the drive. 3. When measuring the voltage, the power should be turned on. Don't just connect the USB powered by. 4. Before adjusting the knob, it must be done with the power off. After the adjustment is completed, perform a power-on test to prevent the driver or the motherboard from burning out. 5. When attaching the heat sink, please pay attention to the distance between the heat sink and the pins, otherwise it will cause a short circuit between the heat sink and the pins. 6. When the drive is working, please do a good job of heat dissipation (heat sink + cooling fan) to prevent abnormal operation of the drive due to overheating. Colour:As Shown Material:PCB+Metal Package Contents: 1 * Stepper Driver