The Powerdrive 121 control system features a host of refinements designed to increase performance and decrease clutter. The Powerdrive 121 implements our impressive Override™ 2 stopper unit which provides a user definable depower on demand. Additionlly the power adjusters have been integrated into the Override™ unit- which keeps them aligned with the depower line, reducing the chances of tangling.The Powerdrive 121 control system features a new reduced diameter bar with softer, embossed EVA grip end to end. It has a smooth stainless center section for improved durability where the QR meets the bar. It integrates a stainless steel swivel into the top of the harness loop. And it now comes complete with Bypass leash.