Features: 2DM860 is a digital two-phase stepper drive, controlled by a new 32-bit ARM processor. This digital driver peripherals subdivision, current, and auxiliaries function dials can be freely set according to needs. Builted in subdivision algorithm enables the motor to run smoothly at low speeds; The medium to high speeds torques compensation algorithm can maximizes the torques of the motor at medium to high speeds. Parameters self-tuning algorithm, capable of adapting to various motors and maximizing motor performances; The builted-in smoothing algorithm can greatly improve the accelerations and deceleration performances of the motor. Single and double pulse control type can be selected. Equipped with overcurrent protections and overvoltage protections. Automatic detections, flexible selection of pulse edges counting method. Specifications: Materials: Plastic Size: about 14.2x9.7x5.3cm/5.59x3.82x2.09inch Power supply voltage: 30AC-80AC Working current: 2.1-8.4Amp Logics input current: 10mA Step time pulse corresponding frequency: 250KHZ Pulse low level time: 2.5US Package Includes: 1set Stepper Motor Controller note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.