Package Included:<br />1 x Arduino R3 Board<br />1 x Engraver CNC Shield Board<br />4 x A4988 Stepper Motor Driver<br />1 x 40-Pin Row Needles<br />1 x Cable<br /><br />(1)Engraver CNC Shield Board<br />Version:3.0<br />Color:Red<br />Size(L*W*H):68 x 53 x 18 mm<br />Voltage:DC 12~36 V (At the moment only the DRV8825 drivers can handle up to 36V so please consider the operation voltage when powering the board.)<br /><br />Features:<br />1.Uses removable A4988 or DRV8825 compatible stepper drivers.<br />2.The extension board can be used for carving hine・ 3 d printer driver expansion board<br />3.GRBL 0.8 compatible. (Open source firmware that runs on an Arduino UNO that turns G-code commands into stepper signals)<br />4.PWM Spindle and direction pins・4-Axis support (X・ Y・ Z ・ A-Can duplicate X・Y・Z or do a full 4th axis with custom firmware using pins D12 and D13)<br />5.Compact design. Stepper Motors can be connected with 4 pin molex connectors or soldered in place.<br />6.Please note that this is an unassembled kit and Basic soldering skills are needed.<br /><br />(2)A4988 Stepper Motor Driver<br />Color:Red<br />Size(L*W*H):20 x 15 x 10 mm<br />Thermal shutdown circuitry:Yes<br />Crossover-current protection:Yes<br />Ground fault protection:Yes<br />Load short-circuit protection:Yes<br />Compatible logic supply: 3.3V and 5 V<br />Five selectable step modes: full・ 1/2・ 1/4・ 1/8 and 1/16<br /><br />Features:<br />1.Mix with slow current decay mo