Cardiac Science G5 Pediatric Intellisense Electrode Pads are for use when the patient is 8 years old or younger or with a weight of 55 pounds (25 kg) or less. Cardiac Science G5 Pediatric Intellisense Replacement Electrode Pads are non-polarized which allows for placement in either location on the chest. To ensure you are ‘Rescue Ready’, Powerheart AEDs automatically perform self-test every day while self testing electrodes and its medical grade battery for presence, function and expiration.