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, CNC format processing files. Support Software: grblcontrol/candle(3 axis), lasergrbl(laser). Supports off-line control to operate it without computer.(the off-line controller need to be purchased separately) Specifications: Power: 150W / 300W (Optional) Material: PCB Control System: GRBL Support Software: grblcontrol/candle(3 axis), lasergrbl(laser) Support System: windows XP/7/8/10 Stepping Motor: 42 step motor (1.3A/0.3Nm/24V) Spindle Motor: 775ER(24V/10000rmp/support PWM0%-100%) Laser: 12V5Amax(1W/2.5W/5.5W/7W/10W/15W) Input: 24V(12-24) Off-line Control: support gcode, txt, tap, nc, ncc, cnc Package Size: 14.5 * 8 * 10.5cm / 5.71 * 3.15 * 4.13in 150W: Item Size: 90 * 85 * 25mm /3.54 * 3.35 * 0.79in Item Weight: 138g / 4.87oz Package Weight: 188g / 6.63oz 300W: Item Size: 14.5 * 9 * 4 / 5.71 * 3.54 * 1.57in Item Weight: 210g / 7.41oz Package Weight: 260g / 9.17oz Package List: 1 * Control Panel 1 * Shell 1 * USB cable