Bosch Three-Line Laser with Layout Beam GLL 3-50 VERSATILE: The Bosch GLL 3-50 offers one horizontal, two vertical lines plus plumb down point - for level, align, plumb and square applications 360-DEGREE: With its 360-degree rotational mounting base, the GLL 3-50 offers manual fine adjustment for one time setup and convenient viewing of laser point on the floor EXTENDABLE: With the Bosch LR2 Line Laser Receiver and Boschs Pulse Laser Receiver Mode, users can extend the alignment by up to 165 feet in bright-light conditions SELF-LEVELING: The GLL 3-50 features Boschs Smart Pendulum System that allows the laser to self level and indicate out-of-level condition. It also locks when switched off Class IIa laser product, &lt;1mW power output Class II laser product, &lt;1mW power output