Increased Spring Tension - New Lock-Down Technology allows for increased internal spring tension for faster launcher drop-away. Totally Captures the Arrow - When stalking, drawing, or during slow let down your arrow will always remain in total containment. VDT (Velocity Drop-Away Technology) - The ONLY drop-away rest on the market with a patented feature that allows the ULTRA-REST to fall away only when the bow is fired, NOT during a slow let down.Unlike other rests that drop-away because of inertia, or vibration, the ULTRA REST relies on the velocity of the Rest moving forward, via the Timing Cord attached to the bows downward buss cable, to initiate the launcher to drop. VDT assures the ULTRA-REST remains in the cocked position even on a slow let down and will only drop- away if the bow is fired.