Bosch 360-Degree Self-Leveling Cross-Line Laser GLL 2-20 VISIBILITY: Features Boschs Visimax technology to deliver maximum line laser visibility up to 65 feet in standard working conditions 360 DEGREE: Provides four-mode functionality, including single vertical, single horizontal, horizontal/vertical combination and lock/manual modes. The 360 degree coverage gives the user one setup point for an entire room SELF-LEVELING: Includes Smart Pendulum System that allows laser tool to self-level while also indicating out-of-level condition to help ensure an accurate measuring SECURE: To provide secure transport, the Bosch GLL 2-20s system locks the pendulum when it is turned off MOUNTABLE: Features the BM3 positioning device to hold the laser and attach objects for precise positioning. The BM3 also includes retractable feet, strong magnets and a ceiling grid clamp Class IIa laser product, &lt;1mW power output