1,Power Supply: 15‑160VDC or 5‑12VDC. If using a 5‑12VDC power supply, the positive pole is connected to the DC 5‑12V input, and the negative pole is connected to the common cathode terminal. 2,3 Frequencies: 3 frequencies, high 8KHZ to 127KHZ, medium 590HZ to 18KHZ, low 82HZ to 3KHZ 3,Drive Control: To control a stepper motor, connect to a drive. Measurement frequency can be PUL and common cathode terminal (GND) two ports. 4,Positive and Negative Pulses: ENand and EN‑ are used to enable positive and negative terminals DIRand and DIR‑ are positive and negative directions. 5,PCB Board: Step motor adopts PCB board, which is resistant to high temperature and cold, and will not be deformed after long term use, thus ensuring long term stability 1 x PWM Adjustable Stepper Motor Controller Item Type: PWM Adjustable Stepper Motor ControllerMaterial:PCBPower Supply Voltage: 15-160V, 5-12VFrequency:Height: 5.8KHZ to 127KHZMiddle: 590HZ to 15.8KHZLow: 82HZ to 2.3KHZ Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.