The Philips AED HeartStart Onsite AED is one of the most popular automated external defibrillators. The Philips HeartStart Onsite was carefully designed for first responders and health care professionals with a need for an AED program. With the combination of technology and design in mind, Philips has significantly upped the ante for AEDs with their HeartStart Onsite. The Philips HeartStart Onsite is Philips' flagship AED within their HeartStart lineup. The Philips HeartStart Onsite is the durable, small, light, and versatile.