1. 24V-50V DC power supply, 8 level adjustable output current 1.0A-5.6A.2. Bipolar constant current PWM drive output.3. Optical isolation input signal, pulse response frequency up to 200kHz.4. Strong anti-interference capability, achieve high precision positioning in complicated environment.5. Low speed zero vibration, and low noise.6. Fit for 42/57 stepper motor and widely used in automatic packaging machine, engraving machine and other automation equipments.Specification:Application: 42/57 stepper motorInput voltage: DC 20-50VOutput current: 1.0-5.6A, 8 level adjustable, 0.5A resolutionDrive method: Bipolar constant current PWM drivePulse response frequency: 200kHz(Max)Insulation resistance: more than the 500MΩInsulation strength: 500V/minColour:blackMaterial:PCB+ABSSize:12 x 7.8 x 3.5cm Package Contents:1 * DM556 stepper driverOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.