The Philips HeartStart FRx AED is the most durable AED manufactured by Philips today. This AED is ideal for first responders and police. Yet it is simple enough for any responder to use. The FRx AED offers low-cost of maintanence with its 4 year long-life battery and its adult pads have an expiry date of every 2 years. The FRx AED is perfect for any organization that wants to keep its employees, members, or visitors safe.