1.this module is a pulse generation module, supply the control signal to stepper driver.To control the stepper motor, it must be equipped with a drive. 2.this simple controller + stepper motor + stepper motor + DC power supply can be composed of a simple set of control platform. 3.the controller has high 5.4k-160khz, middle 540-16.6khz, low 80-2.4khz total of 3 kinds of low frequency signal can be used to select the jumper. 4.can produce pulse signal, can also produce PWM signal, can choose the jumper. 5.the frequency of measurement: PUL and common cathode end. EN==FREE Enable PUL=PULS=CLK Pulse DIR=CW= Direction Common anode Connection method (B) EN+ PUL+ DIR+ connect together to com+. EN- connect EN PUL- connect CLK DIR- connect DIR colour:black material:PCB Package Contents: 2 x Pulse Signal Generator to Stepper Motor Driver Module 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.