Feature: 1. 8 Speed Current Adjustable: This stepper motor driver controller has 8 speeds of current adjustable, 1 speed can be used as the default speed, which can be set by software, you can adjust it according to your needs. 2. 16 Speeds Adjustable: This digital stepper motor has 16 speeds adjustable, and 1 speed can be used as the default speed, which can be set by software to run the first speed, second speed, acceleration and deceleration. 3. Excellent Aluminum Alloy Material: This digital stepper motor controller is made of excellent aluminum alloy material, which is sturdy and wear resistant, not easy to be damaged, and has a long service life. 4. 3 Input Signals: This 2/4 phase digital stepper motor driver uses 3 input signals defined as start and stop, forward and reverse, and enable control (or 2 speed controls). 5. Good Compatibility: This stepper motor driver has good compatibility, voltage support AC 180‑220V, recommended power supply voltage 220VAC, current support up to 8.2A, and can match 2 phase stepper motors of 86, 110, 130 chassis. Specification: Item Type: Digital Stepper Motor Driver Series: DM Command Source: I/O Signal Working Voltage: Approx. 180-240VAC Peak Output Current (A): 8.2 Output Frequency (kHz, Maximum): 24 Logic Voltage (VDC): Number Of Inputs: 3 Number Of Outputs: 1 Features: Built In Pulse Generator for Speed Control. Package List: 1 x Digital Stepper Motor Driver