1. 1.9V-42V DC power supply, bipolar H-bridge constant phase flow drive. The maximum output current is 4.0 A (peak, in 100 ms), optional 8 output currents are possible. 2. Energy saving semi-automatic power lock function, built-in temperature protection and over-current protection, undervoltage protection, prevent reverse gear. 3. Can control the forward and reverse rotation of a 2-phase stepper motor with 1-2, W1-2, 2W1-2 and 4W1-2 phase excitation mode. 4. 6 subdivision modes with up to 32 segments can be selected and used for high division purposes. Suitable for 4-wire, 6-wire and 8-wire stepper motors. Applications - Precision positioning in compact CNC machines, engraving devices, or lab automation systems requiring bidirectional drive and multiple current settings. - Drive for 3D printers or robotics axes, enabling smooth micro-stepping and reliable protection features. - Use in automated test rigs or instrumentation where high division accuracy and motor compatibility with 4/6/8-wire motors are beneficial.