The dynamic spj joystick is used on later model invacare powerchairs.
Models such as the M51, M71, M91 and others. It is a 4 button
keypad, not for use with a power seating system. It has been
discontinued, and its successor, the MK5 SPJ+ will work in its`
place. You will however need a cord for the SPJ+ and if you email us
to that effect, we will include it for you. Sometimes called
MK5 SPJ MWD