The module is a pulse generation module, providing a stepper driver as a signal. To control a stepper motor, it must be equipped with a driver. A simple controller + stepper driver + stepper motor + DC power supply can form a simple control platform. (Only the controller is included.) The controller has a total of 3 types of frequency signals: High 5.4k-160khz, Medium 540-16.6khz, and Low 80-2.4khz, selectable via jumper. It can generate pulse signals and PWM signals, selectable via jumper. Frequency Measurement: You can measure PUL and common cathode (or common anode) two ports. Power Supply: 8-24V Frequency Signals: 5.4k-160khz, 540-16.6khz, 80-2.4khz Color: Black Material: PCB Package Contents: 1 x Controller Only the above package contents are included; other products are not. Note: Light photography and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowable measurement error is +/- 1-3 cm.