42 57 Stepper Motor Driver Positive Negative Angle Pulse Speed Control Board Programmable PLC Serial Communication Q81COOTDTYCotive Features: 100% Brand New & High Quality100% Brand New & High Quality Power Supply Range: DC 5V - 30V UniversalSpeed Range: 0.1 - 999/min (The product is equipped with a power-off memory function)Positive & Negative Pulse Range: 1 - 9999 pulsesAdjustable Delay Time: 0.1 seconds - 999.9 secondsFunction Selection Setting Range: P-1 - P-6; Division Selection Setting Range: 1 - 128 DivisionSpecification: Material: ABSaga: 85g Size: 71x39x2 6mm/2.79x1.53x1.02inchPackage Included: 1x Stepper Motor DriverNote: 1. Please allow 1-2cm errors due to manual measurement, please make sure you do not mind before ordering.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.