This Infant/Child Key is used for defibrillation with infants or children under 55 lbs or 8 years of age. This key works with the FRx defibrillator. When this key is inserted, the defibrillator will provide appropriate voice instructions for pediatric patients and reduce the shock from 150 to 50 Joules (J). The key shows graphics for proper pad placement for infants and children.