The Bosch GCL100-40G Green Beam Self-Leveling Cross-Line Laser with Plumb Points uses green-beam technology, which emits green lines and points up to 4X brighter than standard red beams. This gives the laser a working range for the lines of up to 165 Ft. The laser produces vertical, horizontal, cross-line modes, as well as upward and downward green plumb points.