The Bosch GLL50-20G Self-Leveling Cross-Line Laser projects two level and plumb green beams that are up to 4X brighter than standard red beams. Featuring a 65 Ft. range that allows for leveling within a 1/4 In. accuracy at 30 Ft., it’s a must-have for any tool bag. With its power flexibility, operate using the included AA batteries or purchase the Bosch 3.7V Lithium-Ion 1.0 Ah Battery (sold separately) that can even be used while charging to diminish downtime. Built-in VisiMax Technology optimizes line visibility and runtime for working conditions to further Maximize usage. Its ergonomic, compact, lightweight design and IP55 dust- and water-resistant rating, provide for both comfortable and dependable operation.