This is the control box that the motors plug into under the chair. This is for chairs with heat and/or massage that have two motors; one motor makes the chair go up & down, and the other motor reclines the back almost all the way to a bed. The hand control on these type chairs will have one toggle switch for up & down, and another switch below that that moves from side to side, and a red button and a white button below that (our part # ‘s 8215 and 8215QD).