Dear Mrs. J.O.:

An AED is a medical device that, through electrodes placed at key points on the torso, analyzes a person's heart rhythm and advises a user to deliver a brief but powerful shock when appropriate. This electrical stimulus to the heart can interrupt an ineffective (ventricular fibrillation) or inefficient too rapid (tachycardic) rhythm.
An AED cannot deliver a shock to a healthy heart.

AED's are highly reliable, effective, portable and easy to use. You will be seeing these life saving devices being placed in key areas in public spaces. They will be easily accessible to trained individuals so that they can be deployed during the brief window of time crucial to survival and optimum recovery.