Patented Lock-Down Technology. Patented eccentric cam, brakes, and Locks-Down into the Drop Away position, guaranteeing total fletching clearance. NEW Instructional DVD included...with Bonus Hunts! Increased spring tension. New Lock-Down technology allows for increased internal spring tension for faster launcher drop-away. Totally captures the arrow. VDT (Velocity Drop-Away Technology). Internal cam/brake design, and laser cut felt. Shoot shorter arrows and increase speed. Total bow shelf clearance. Lifetime limited warranty.