CPR Prompt Aids are compact, portable units that prompt trained rescuers through the proper procedures and sequences of CPR in real time. They can be used as training aids and emergency response aids. These devices are especially important since the retention of CPR skills and knowledge among laypersons and professionals was identified as a major issue at the 1992 conference of the American Heart Association Emergency Cardiac Care committee. More recent studies have shown that retention of CPR instructions tends to deteriorate as early as 3 months after training, even among the highly trained, and especially for layperson rescuers who, unlike professionals, may never have been tested by a real emergency. Stress during an actual emergency can further debilitate the rescuer's memory. Our CPR Prompt Aids are designed to assist the rescuer during emergencies and high stress events.