Feature: 1. Adapted Motor: Our 2 phase stepper motor controller board is suitable for 42, 57, 60mm stepper motor and can do the firm fitting. 2. Multi Protecting: This 2 phase stepper motor controller adopts over current, over voltage, under voltage, phase error, encoder error, position error protection. 3. Efficient and Accurate: This spontaneous pulse two phase stepper motor driver is stable and durable, efficient and accurate. 4. Low Vibration and Noise: The 2 phase stepper motor controller is low vibration, low noise, low temperature rise, high response. 5. Current: This spontaneous pulse two phase stepper motor driver has the current of 2.4 to 7.8A continuously adjustable and space saving. Specification: Item Type: Stepper Motor Driver Material: Aluminum Alloy Adapted Motor: For 42, 57, 60mm Stepper Motor Power Supply: DC24-80V Or AC20-70V Current: 2.4-7.8A Continuously Adjustable Features: Stable Performance, Small Size, Space Saving. Package List: 1 x Stepper Motor Controller Note: The voltage should not exceed DC40V. When the driver is powered on, the green indicator is on.