The #8215 controls are for chairs with both heat and massage and infinite control systems; the control has a large paddle switch for up & down, and below they have a smaller white switch  that moves side to side to lay the back down and two smaller switches (red and white) for the heat and massage.  The #8215 has a long one piece cord with a FIVE PIN plug that goes down through a hole in the chair and plugs in to the control box underneath the chair.  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.