this is a high performance-price-ratio and full function of MACH3 interface board has the following features: 1. fully supports the MACH3 and other support parallel control of computer software. 2. USB power supply and the peripheral power supply phase separation to ensure computer security. 3. a peripheral wide voltage input, 12-24V and anti-reverse function. 4. all of the input signals are all the coupling isolation, can be connected to the emergency stop, tool, limit, etc, to ensure computer security. Material: pcb colour: blue Package Contents: 1 x MACH3 Interface Board 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.