The Bosch GLL 2 self-leveling cross-line laser is a compact leveling and alignment solution, which features a smart pendulum system that self-levels and indicates out-of-level condition; offers switch slider to lock for transport. Easy to use one button allows to chose between cross-line, horizontal or vertical lines depending on the application. The unit includes a flexible mounting device that can clamp to practically any interior surface for maximum versatility. Horizontal and vertical line modes - projects two lines independently or together for a wide array of level and/or alignment applications.