You have pacemakers and defibrillators. Pacemakers are able to pace your heart if your heart rate goes too slow, whereas defibrillators are just like the pads that you see on TV, when somebody goes into a deadly abnormal rhythm, they are shocked by the EMS team, and brought back into a normal rhythm. Well, this defibrillator is like having those pads with you at all times, so all defibrillators can shock somebody out of a very fast rhythm, but they also have pacemaker capabilities, so that if somebody's heart rate does drop too low, that defibrillator can also serve as a pacemaker. So defibrillators can be pacemakers, but pacemakers cannot shock like defibrillators. With pacemakers and defibrillators, the battery is located within the device, and these are relatively long-lasting batteries. They can last anywhere between five to 10 years depending on the device. Often times we're referred to for lead extractions for devices that may have been in for a long period of time. Aft...