Makita 3d-4d 16lines Laser Level Li 12v Max Cxt Xpt Self-leveling 360° 3-plane G. 360° X 4 16 lines(4D). 1 Place the instrument on A tripod, T-type wall mounting bracket or lifting platform as needed. 2 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. 3 Touch H key on the touch panel to control horizontal opening and closing. At this time, you can adjust it to the angle you want without alarm or flashing. Note: The positive and negative terminals of the battery are properly installed. Please remove the battery if it is not used for a long time. Please charge for more than 10 hours when you use it for the first time. Please turn off the main switch after use.