6N137 high-speed OptoCouple to ensure high speed without losing steps. 42,57,86 Stepper within 3A 2/4 -phase / 4 wire / 6 wire stepper motor. Automatic half-decay. Excitation mode: synchronizing, half step, 1/8 step, 1/16 step. Current level is adjustable to meet your application needs. Large heat sink for good heat dissipation. Overheating and over-current protection circuit to ensure optimal performance.
Arduino Uno R3
Arduino Uno R4 Plus