Extended two-year warranty for your Philips HeartStart OnSite AED. The AED comes with an eight-year warranty at the time of purchase. Give your Philips HeartStart OnSite AED a full decade of the manufacturer's warranty with this two-year extension to go with the original eight-year warranty. And give yourself the peace of mind which comes from knowing, should an issue arise with your life-saving AED, you are covered for a full ten years. Think of it as assurance insurance.