Bosch GLL50-20GL Green-Beam Self-Leveling Cross-Line Laser projects 2-bright, level and plumb green beams that are up to 4X brighter than standard red beams. With its power flexibility, operate using the included Bosch 3.7-Volt Lithium-Ion 1.0 Ah Battery that can even be used while charging to diminish downtime or with 2-AA batteries (sold separately). Built-in VisiMax technology optimizes line visibility and runtime for working conditions to further maximize usage. Its ergonomic, compact, lightweight design and IP 55 dust and water-resistant rating, provide for both comfortable and dependable operation. The full rubber overmold housing helps protect every major impact point, acting like a roll cage to safeguard the tool. Equipped with a Smart Pendulum System, the tool self levels, will indicate any out-of-level condition and then locks when switched off for secure transport. Simply tilt the laser to use the lines at an angle with ease. Position the tool with the included integrated magnetic mount or utilize the ¼ In. threading mount that fits with like-sized tripods.