LifePak CR Plus Automated External Defibrillator was manufactured from May 20, 2004 through August 11, 2007 and distributed from May 20, 2004 through December 4, 2007. These devices are used by emergency or medical personnel, or by others who have taken the appropriate training to use this AED. The devices are intended to treat adults in cardiopulmonary arrest (heart attack). They analyze an unconscious patient’s heart rhythm and automatically deliver an electrical shock to the heart if needed to restore normal heart rhythm. The AED instructs the responder, by voice prompts, to press the shock button. However, the shock button is covered and is not visible. Therefore, the responder is not able to provide therapy (shock).