PM 40-MG green laser is 4 times more visible than red lasers, so you can work at distances up to 65 ft. without accessories to mark the beam Centric design for fast and easy vertical layout Maximum operating distance: 66 ft. (points), 66 ft. (lines), 164 ft. (lines, with receiver) All the lines you need - 4 vertical and a 360 horizontal lines, bottom plumbing point Sets the level bar for drywall, electrical and mechanical applications Wall mount increases performance in difficult to reach locations 12-Volt battery offers 10-hours of run time