Bosch GRL160DHV DualAxis Self Level Rotary Laser Patented dual-laser system - separate horizontal and vertical lasers for use together or individually for both indoor and outdoor applications Smart Pendulum Leveling System - Self-levels, senses and indicated out-of level condition, locks when switched off Beam Customization - 6-lengths (0-Degree, 3-Degree, 10-Degree, 30-Degree, 45-Degree, 90-Degree, and 120-Degree) and 3 rotation speed (350, 600, 1200 RPM) settings for diverse application and lighting conditions Easy Field Recalibration - Maintain accuracy and prevent downtime Limited 3-Year warranty Class IIIa laser product, &lt;5mW power output