Instructions: - Place the instrument on the tripod, T-type wall mounting bracket or lifting platform as needed; - Push the main power switch forward to the ON position and the machine starts to work. The horizontal 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 closures 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. - ⁠Touch this key again for more than 3 seconds, with one click (tick) to release this function, the instrument works normally.