Because sudden cardiac arrest is most effectively treated within the first few seconds or minutes the AED, Automatic Defibrillator, has the potential to save thousands of lives that could be lost if treatment is delayed. The Zoll AED Plus combines superior biphasic defibrillation with fast and simplified electrode placement. The AED Plus uses a brilliant new graphic/voice user interface to help the rescuer every step of the way. The electrode pad helps the rescuer perform CPR. A sensor on the CPR-D pads tracks the rescuer's compression depth and rate as soon as CPR begins. The electrode comes complete with rescue essentials and tamper-evident seals and it lasts four years. Features include audio and visual coaching and Rectilinear Biphasic™ Waveform. Requires only one electrode pad. Runs on inexpensive, consumer lithium batteries. The "Good Samaritan" law prevents AED Liability and opens up the use of easy-to-use AED's by most any staff. Each second and minute counts for a life and death situation.