Bosch GLL3-50 Three Line Laser with Layout Beam One horizontal, two vertical lines plus plumb down point - for level, align, plumb and square applications 360-degree rotational mounting base - manual fine adjustment for one time setup and convenient viewing of laser point on the floor Pulse laser receiver mode - for use with optional LR2 laser receiver at up to 165 feet and in bright light conditions Smart pendulum system - self-levels and indicates out-of-level condition; locks when switched off Class IIa laser product, &lt;1mW power output