Feature:1. USB POWER SUPPLY: Support computer software such as for MACH3 and parallel port control, USB power supply and peripheral power supply are separated to protect computer security.2. SAFE CONNECTION: Peripheral 1224V wide voltage input, and with anti reverse connection function, can perform emergency stop to protect the limit of computer safety.3. 17 PORTS OUTPUT: 1 way relay output is used to control the spindle switch, all 17 ports are open, and can be connected to an optocoupler drive to control 5 axes stepper motor.4. OPTOCOUPLER ISOLATION: All the 0-10V analog output voltage isolated by optocoupler can be controlled at the spindle speed through the corresponding analog interface converter.5. OTHER FUNCTIONS: P1 as PWM output can be controlled by optocoupler input spindle speed controller, and can be driven by common cathode or common anode input level 5V.Specification:Item Type: Stepper Motor Driver BoardProduct Material: ABSMotherboard Size: Approx. 90 x 60mm / 3.5 x 2.4in.Package List:1 x Stepper Motor Driver Board (Blue)1 x Dual USB Cable1 x DB25 CableNote:Due to manual measurement, please allow 1‑3 cm error. Thanks for your understanding.