While the majority of AED pads come with one set of electrodes on two pads that must quickly be placed on the Sternum and Apex of a SCA victim, Zoll knew there must be an easier way. In order to help eliminate confusion and speed up the rescue process, the CPR-D padz were invented. A rescuer need only open up the padz package and place the pre-connected electrode directly in the center of the cardiac arrest victim’s chest. No confusion, no mistakes. This unique one-piece pad incorporates a pressure sensor, known as a “puck,” which allows the rescuer to know in real-time the effectiveness of his CPR compressions and modify his technique accordingly. Compression depth is shown on the Zoll AED Plus’s LCD screen. The AED Plus also responds with voice prompts that gives the rescuer immediate feedback such as “Good Compressions” or “Push Harder.” This advanced technology is enormously significant since most lay people do not compress to the AHA’s recommended depth of 2“.Additionally, the CPR-D Padz don’t just have advanced features, they are also easily maintained. With a shelf-life expiration date and battery expiration date of five (5) years.