Zoll AED CPR-D padz One Electrode Pad is Easier than Two ZOLL's Full-Rescue AEDs feature CPR-D padz®, a one-piece, pre-connected electrode with Real CPR Help feedback.Ordinary AEDs require that the rescuer use two separate electrodes. By using CPR hand placement as the landmark, it is easy to place the CPR-D padzon the victim quickly. The CPR-D padzalso lasts five years-the longest shelf life of any defibrillator electrode sold today.