One-switch Operation: Simple one-switch operation powers 3 laser lines on and off, projecting 3 level line onto surface; PREXISO allowing homeowners to start hanging pictures, mounting frames, home renovation easily Angle Dial LED light: The angle dial is used for angle reference, easily change the angle you want within the range of 15~75; Angle dial bubble vial designed with LED lights for easier reading in dark workspaces Accuracy Surface Laser Lines Bubble Vials: PREXISO laser level projects horizontal and vertical lines on any SURFACE up to 30Ft, 2 laser lines are at an exacting 90 angle; It built-in bubble vials ensure more accurate leveling. Class II laser product, maximum laser output 1mW Bonus Wall Mount Base: Wall mount base helps free hands for marking. It with 3 Fixing Ways: 1) with 2 pins for rough surfaces; 2) with 10 self adhesive strip for smooth surfaces; 3) with Pin Holes on top for any surface PREXISO surface laser level has a compact design that can generates two lines on the floor, wall or other surface at 90 degree angles to help you align angle at 90 degrees for surface layout. Perfect for woodworking, stair starting board, shelves, shelf, molding, tiled or any other work that requires precise alignment