The Physio-Control Lifepak 500 is designed to be used by first responders in cardiac emergencies. The AED determines which shock is right for the individual and ensures safe and simple delivery for widespread deployment. It’s lightweight design is perfect for grab-and-go portability. It weighs just 7 pounds, and features the ADAPTIV Biphasic technology waveform. Simple 2 or 3 button operation Low maintenance Durable Powerful User-friendly