Features:USB interface connected, much convenient than serial port or parallel port.Supporting PWM stepless speed regulation and gray graving.High integration, easy to assemble, good for DIY enthusiast and 3D printer manufactory.Off-line Control: supports gcode, txt, tap, nc, ncc, format processing files.Support Software: grblcontrol/candle(3 ), lasergrbl().Supports off-line control to operate it without computer.(the off-line controller need to be purchased separately)Specifications:Power: 150W / 300W (Optional)Material: PCBControl System: GRBLSupport Software: grblcontrol/candle(3 ), lasergrbl()Support System: windows XP/7/8/10Stepping Motor: 42 step motor (1.3A/0.3Nm/24V)Spindle Motor: 775ER(24V/10000rmp/support PWM0%-100%): 12V5Amax(1W/2.5W/5.5W/7W/10W/15W)Input: 24V(12-24)Off-line Control: support gcode, txt, tap, nc, ncc, Package Size: 14.5 * 8 * 10.5cm / 5.71 * 3.15 * 4.13in150W:Item Size: 90 * 85 * 25mm /3.54 * 3.35 * 0.79inItem Weight: 138g / 4.87ozPackage Weight: 188g / 6.63oz300W:Item Size: 14.5 * 9 * 4 / 5.71 * 3.54 * 1.57inItem Weight: 210g / 7.41ozPackage Weight: 260g / 9.17ozPackage List:1 * Control Panel1 * Shell1 * USB cable