Philips HeartStart FR2 Pads are designed for use with Philips (and Laerdal) HeartStart FR2 and FR2+ AEDs, as well as with older Forerunner AEDs. These electrode pads are recommended for use on patients over the age of 8 or above 55 lbs. (25 kg.) in body weight. For children under 8 years of age or less than 55 lbs., we suggest using the Philips HeartStart FR2 Infant/Child Reduced Energy Defibrillator Pads (model number M3870A).