Answer:
Implanted Defibrillator
Location: Chest Wall, Heart and Mediastinum
Implanted Cardioverter-Defibrillator (ICD) contains pacemaker and defibrillator functionality. It may have single chamber, dual chamber, or (often) biventricular leads. The leads in an ICD are characterized by one or more coils - a thickened portion that is used to deliver the shock. The pacemaker 'can' (pulse generator) is also distinguished by the presence of a capacitor as well as a battery.
The defibrillator component requires 2 coils; sometimes both coils are along a lead or leads in the venous system, but now the can itself can serve as one lead.