Bosch GLL2-50 Self-Leveling Crossline Laser with Pulse Vertical, horizontal, and cross-line modes--projects two lines independently or together for level and/or plumb applications Highly visible laser lines with wide 130-degree horizontal, 160-degree vertical fan angles Robust over-molded housing--IP54 water- and dust-proof to ensure years of dependable operation Pulse laser receiver mode for use with optional LR2 laser receiver at long distances and/or in bright lighting Smart pendulum leveling system self-levels, senses and indicates out-of-level condition, locks lines for use at any angle, and locks when switched off Class IIa laser product, &lt;1mW power output