Offline engineering: GRBL1.1f firmware is adopted, with stable performance. Optional offline module to realize offline tool setting and engraving. Directly enter the for engraving, without programming and design, simple and convenient Adjustable power: PWM or TTL signal control is supported, and the power is adjustable between 0-100%. The spindle supports 0-100% adjustable PWM power. Enhanced spindle drive can support 20000rpm spindle Stable overcurrent protection: overcurrent protection for to avoid damage, upgrade integrated drive, 2A high current, high stability. power button switch Good heat dissipation: professional shell protection, fan active heat dissipation, will not heat for a long time. fan ports to force cooling, enclosures to the control panel during portation and avoid short circuit problems during use Short circuit protection function: cancel module, use the integrated to drive, with short circuit protection, integrated heat dissipation aluminum Colour:black Material:pcb Package Contents: 1 x CNC Control 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.