The driver uses discrete components structure, compatible with two-phase 4-wire, 6-wire, 8-wire stepper motors when wiring is correct and no overvoltage occurs. Suitable for 57 series two-phase 4-wire, 6-wire, 8-wire stepper motors with 4.5A or less (including 4.5A). Features: 20KHz chopping frequency; Optical isolation signal input; Output current adjustable via DIP switch; Bipolar constant current chopping method; High segmentation options: 2,4,8,16,32,64,128,256,5,10,25,50,125,200; TTL input signal compatible, accepts differential signal input. Specifications: Power supply: DC 24-60V; Maximum current: 4.5A; Output phase current: 1.5A-4.5A; Logic input current: 10-20mA; Operating temperature: -15°C to +45°C; Size: 11.7*8.5cm/4.61*3.35inch. Note: Manual measurement may have 1-3mm error. Color as shown in the picture. Due to monitor differences, actual color may vary slightly. Package Contents: 1 x Stepper Motor Driver