... Line 4. With Alarm 5. CE, GS, ROSH 4V1H Rotary Laser Level Pro Model Number: ZY/SA05-4V1H Description:Laser wavelength: 635nmLaser ... and Align: Walls, Doors, Frames, Stud Beams, Windows and Skylights; Level Electrical Outlets; Stud and Curtain Wall Plumbing, HVAC, Plumbing, Pipe Installation ... diagram as below:Production pictures for reference:Optional Parts: 4V1H Rotary Laser Level Pro