One horizontal and two vertical lines at 90 degrees. Locking compensator protects pendulum during transport. Visual out-of-level indicator. Manual mode for use at any angle. 1/4 In. tripod thread for use at any angle. Ideal for flooring and alignment. Laser wavelength 635nm +/- 10 nm (red), laser classification Class II, working temperature 32 Deg. F to 104 Deg. F, dimensions 2.5 In. x 3 In. x 3.6 In., weight 8.8 Oz. without batteries. Includes (2) AA alkaline batteries.