The LineLazer IV 3900 features the company's new Auto-Layout system, which is accurate to ¼-in. at 100 ft. It automatically places dots for layout jobs, eliminating the need for tape measures and users having to bend to mark the lines. An advanced reduction system limits the vibrating engine's influence on any lines. Using a lightweight chromex pump rod and gunholder, the walk-behind machine is quick and mobile for more effective line striping.