The pads are "SMART" because they work with the device to sense whether they hve been removed from the cartridge and placed on the person's skin. Pictures on the pads illustrate correct placement.

Defibrillation pads should be replaced after each use, or every two years if they have not been used.

Children under 8 years of age or weighing less than 25kg. (55lbs.) including infantsshould be treated using HeartStart Infant/Child SMART Pads. These pads instruct the defibrillator to reduce the energy of its shock from 150 to 50 joules(J), a more appropriate dosage.

The Infant/Child Pads cartridge is marked with an indication of the victim's weight and with a Teddy Bear icon for easy identification. Purchase of this product requires a prescription.