Check the listing for details. Stepper Motor Drivers 4A Upgraded Version Stepper Driver Pack of 2. Condition: New. Listed at 25.83 USD. About the product:Driver is a professional two-phase hybrid bench stepper motor driver, suitable for a variety of small and medium-sized automation equipment and instruments, such as: engraving machine, marking machine, cutting machine, plotter, CNC machine tools, hold and place devices.Good Choice for you:1.With overheating, input voltage anti-reverse protection and other functions;2.Small size, easy to install.Specification:Input voltage: 9~24VDC; Output Current: 0.5A~4.0A; Segment Optional: 1/2/4/8/6/32 Segment; Suitable for Step Motor: 39,42,57mm Stepper Motor.Easy to use:Around to have 20mm of space, can not be placed next to the other heating equipment, to avoid dust, oil mist, corrosive gases, and high humidity is a too big and strong vibration.