The Cardiac Science Powerheart G5 adult defibrillator pads have a 2 year shelf life and have the added advantage of a non-polarized design for quick and easy application. The replacement Powerheart pads are supplied as a pair in a sealed pack ready for use. Designed for use with the Cardiac Science Powerheart G5 defibrillator, Supplied as a single pair, Non-polarized design: can be used in either location on the chest, Shelf life: 2 years (from date of manufacture), Suitable for patients over 8 years old or 25kg in weight This item is shipped directly from the manufacturer, please allow 7 days for delivery.