The #8215QD controls are for chairs with both heat and massage and infinite control systems that has a  quick disconnect SEVEN PIN plug that normally unplugs in the side or magazine pocket of the chair.  The control has a large paddle switch for up & down, and below that they have a smaller white switch  that moves side to side to lay the back down, and then two smaller switches (red and white) for the heat and massage.  Before you order, please look at the plug on the end of your hand control cord, and order the control that matches the notes above.