Behold the persistence of PERS (Personal Emergency Response System). Like the little engine that could, this product category refuses to exit. Also called Medical Alarms, Medical Alerts and panic buttons, it is most recognizable as the fear-mongering "I've fallen and I can't get up" device. PERS has been around for decades, but has seen relatively little innovation over most of that time. Actually it's worse, when you think about it.