Philips HeartStart OnSite Posted on September 21, 2017 by Philips HeartStart OnSite Philips HeartStart FRx Defibrillator 861304 (‘FRx’) automated external defibrillator (AED) package is small, lightweight, rugged, and is designed for simple and reliable operation by minimally trained users. This Philips FRx AED is highly configurable for local protocol considerations.