This module is a pulse generation module and supplies a stepper driver as a signal. To control the stepper motor, it must be equipped with a driver. This 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 kinds of frequency signals: high 5.4k-160khz, medium 540-16.6khz, and low 80-2.4khz, which can be with a jumper. It can generate pulse signal and PWM signal, and it can be by jumper. Frequency measurement: You can measure PUL and common cathode (or common anode) two ports. Power Input: 8-24V Frequency Signals: 5.4k-160khz,540-16.6khz,80-2.4khz Colour:black Material:PCB board Package Contents: 4 x Controller Only the above package content, other products are not included. Note: Light reflection 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.