... . With Alarm 5. CE, GS, ROSH 4V1H Rotary Laser Level Pro Model Number: ZY/SA05-4V1H Description:Laser wavelength: 635nmLaser class ... .; Easily Lay Out Right Angles; Establish Diagonals and Footings for Decks, Porches, and Patios; Grade Determination; Dry Wall Installation.Accessories:Three ... :Production pictures for reference:Optional Parts: 4V1H Rotary Laser Level Pro