Features: Inputs features: High speed optoelectronic isolation signal inputs. Single-chip PWMbipolar sinusoidal choppers ensures low vibration and high efficiency. High subdivision: 6 subdivision modes of up to 32 subdivisions can be selected, and can be used for high subdivision purposes. Energy-saving semiautomatic current lock function with built-in over-temperature protections and over-current protections. Whether you're working on a CNCmachine or a 3D printer, the Stepper Motor Driver provides reliable and efficient motor control, ensuring smooth and accurate movements. Special reminder: The DCmotor governor is connect to a DCpowers source and cannot be directly connect to household 220V ACpower. Specifications: Material: Plastic Inputs voltage: DC9-60V Output voltage: linearitys under load Output current: 0-20A (within 10Amp after long-term use, pay attention to maintaining smooth heat dissipation conditions of the modules) limit power: 1200W Speed regulation type: PWMregulation Speed regulation mode: Potentiometer (linearitys) Control frequency: 25KHZ Modules size: 9.5x5.7x2.8cm/3.74x2.24x1.10inch Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1set Stepper Motor Driver