Description: This board as a driver expansion board, can be used for engraving machines and 3D printers. 3 axls stepper motor driver, compatible with micro-drive laser engraving machine, three-axls CNC engraving machine. 2A can be controlled within the two-phase four-wire stepper motor. It is quiet convenient to use. Features: 3 axls stepper motor driver, compatible with micro-drive laser engraving machine, three-axls CNC engraving machine. 2A can be controlled within the two-phase four-wire stepper motor. Released the digital IO interface, easy to connect to other modules, such as ENDSTOP. Released the I2C interface, you can connect to the LCD I2C or other I2C module. Power DC5V interface, 7.5-12V voltage input. It is compatible with GRBL, and works with nano. Specifications: V4 Board Size: 7.2 x 5.9cm / 2.83 x 2.32" Nano Board Size: 4.3 x 1.8cm / 1.69 x 0.7" Driver Size: 2 x 1.5cm / 0.78 x 0.59" Heat Sink Size: 0.8 x 0.8cm / 0.31 x 0.31" Package Includes: 1 x CNC Shield V4.0 1 x Nano 3.0 Board 3 x A4988 Drivers 1 x USB Cable 3 x Heat Sinks NOTE: WE DO NOT PROVIDE ANY TECHNICAL HELP.