Cartridge can be easily snapped into the OnSite AED, making replacing your electrodes easier than ever Defibrillation pads for patients under 8 years of age or weighing less than 55lbs Featuring a convenient Philips "pull" handle, these AED Defibrillator Electrode Pads are easily accessed for efficient use and time savings Pads instructs defibrillator to provide voice instructions appropriate for a pediatric patient and reduce energy of shock from 150 to 50 Joules