"Remain calm!" - Using patented advanced microchip technology, the CPR Prompt Audio Rescue and Practice Aids are voice-promping devices that talk students and CPR-trained individuals through every step of adult, child and infant CPR- in real time. Meets American Heart Association, Class !!a recommendations for "improving acquisition of CPR psychomotor skills." Features volume control, wall mount, instructions and a one-year warranty. Requires two 9V batteries (not included).