Feature: 1. Signal Generator Module: This module is a pulse generation module that provides control signals to a stepper driver. 2. Control Motor: In order to control a stepper motor, the user must have a driver. This module can perform suggested speed regulation, control forward and reverse rotation, etc. 3. 3 Types of Signals: The controller has high 5.4k‑160khz, middle 540‑16.6khz and low 80‑2.4khz total 3 types of low frequency signals available for jumper selection. 4. Multifunction: This controller module can generate pulse signal, also can generate PWM signal, or can select jumper, various functions. 5. Easy to Use: This simple controller can be used with a stepper motor and DC power supply to form a simple control platform. Specification: Item Type: Adjustable Stepper Motor Controller Material: PCB Measurement Frequency: PUL and Common Cathode. Package List: 1 x Adjustable Stepper Motor Controller Note: Different stepper drivers may be marked with different namesEN = ENA = FREE enabledPUL = PULS = CLK pulseDIR = CW = CWW direction