Features: brand new and high quality Power supply: 15-160VDC or 5-12VDC. If you are using 5-12VDC power, positive end connect for DC 5-12V Input, negative end connect Common Cathode End. 3 Frequency: High: 5.8KHZ-127KHZ, Mid: 590HZ-15.8KHZ, Low: 82HZ-2.3KHZ PUL + and PUL- pulsed positive and negative; EN + and EN- is to enable the positive and negative terminals; DIR + and DIR- are the positive and negative directions. Frequency of measurement can amount PUL and common cathode terminal (GND) two ports. Easily control the speed of motor by turning the high sensitivity knob, control the forward and reverse of the motor by pressing for key. Specifications: Item: Stepper Motor Drive Power supply: 15-160VDC or 5-12VDC Frequency: High: 5.8KHZ-127KHZ, Mid: 590HZ-15.8KHZ, Low: 82HZ-2.3KHZ Note: To control the stepper motor, must connect to the driver Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment Package includes: 1 PC x Stepper Motor Drive