This is the control box that is used with chairs that have our part #8290, 8291, and 8298 hand controls.  It will have the name “Tranquil-Ease” and the notation “FR-LIFT” on the control box.  If you are having a problem with the chair, and a new hand control didn’t fix the problem, this is usually the part you need, especially (but not always) if you hear “clicking” in this box when you push the buttons on the hand control.