Be sure you're prepared in case of a cardiac arrest emergency involving an infant or child. This package contains one pair of child/infant defibrillation pads for use with the Defibtech Lifeline AED. Use on infants and children under the age of 8 or under 55 lbs. Pads should be stored connected to the AED or in the available carrying case. Use Child/Infant Electrode pads only with Defibtech Defibrillators with software version 1.203 or later.