REVERSE MODULE: The T-Maxx has a superior, patented transmission design that allows full proportional control of the throttle and brakes while in reverse. The Traxxas Reverse Module makes it easy to install the same sophisticated reverse capability into the S-Maxx. The package contains all the necessary parts and hardware, including the extra servo. S-Maxx already has the required 3-channel radio system. All major components are assembled to make installation as easy as possible. Kit includes detailed instructions and colorful retail packaging.