Laser Beam: 360° × 4 16 Lines (3D-4D) 1) Place the device on a tripod, T-type wall mount, or lifting platform as needed; 2) Push the main power switch forward to the ON position and the machine starts working. The horizontal window automatically opens and produces four horizontal laser beams; 3) Touch the H switch on the touch panel to control horizontal opening and closing; 4) Touch the V switch on the touch panel once, open a vertical window with one click (click), repeat again, the second vertical window opens, and the third touch closes both vertical windows; 5) Long press this switch for more than 3 seconds, you will hear a click (click) and the diagonal function will be activated. At this time, you can set it to the desired angle without alarm or flashing. 6) Touch this switch again for more than 3 seconds, with one click (click) to release this function, the instrument works normally. Note: The positive and negative terminals of the battery are installed correctly. Please remove the battery if it is not used for a long time. Please charge for more than 10 hours when using it for the first time. Please turn off the main switch after use. Please use the charger that matches the device for charging. Please use this device in the environment for which this device is described.