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 Selected With A Jumper. It Can Generate Pulse Signal And Pwm Signal, And It Can Be Selected 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: 1 X Controller Only The Above Package Content, Other Products Are Not Included. Note: Light Shooting 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.