Single lever, dual action controls operate both throttle and shift, and can be used on inboard, outboard and sterndrive-powered vessels. Can be installed horizontally or vertically, on the starboard or port side of the boat. They include a brake tension release system that is adjustable from outside. The pull-out handle disengages shift for warmup. Includes X50 neutral safety switch, which prevents in-gear starting. B184MERC model includes a power trim switch conveniently located in the handle grip that enables easy tilting of the engine. For Mercury or MerCruiser engines. Includes X50 - 38817 S neutral safety switch for trim and tilt functions and K35 - 34730 U connection kit for Mercury cables.