Laser ray: 360X 416 lines (3D-4D) Push the main power switch forward to the ONposition and the machine starts to work. Thehorizontal window automatically opens and produces four horizontal laser rays; Touch H key on the touch panel to control horizontal opening and closing; Touch the V key on the touch panel once, open a vertical window with one click (tick), repeat again, the second vertical window opens, and the third touch closues two vertical windows; Long touch the key for more than 3 seconds, and a click(tick) will be heard, and turning on the diagonal function. At this time, you can adjust it to the angle you want without alarm or flashing.