The Philips HeartStart OnSite Adult Training Pad Cartridge can be used on the HeartStart OnSite Trainer or the HeartStart OnSite AED. When placed on the real HeartStart OnSite AED, the pads will convert the AED into a trainer, suspending its ability to shock. While the training cartridge is connected to either unit, 8 rescue scenarios are activated to give the user a hand-on experience of how a real rescue will feel. The voice prompts will change depeding on whether the adult or the pediatric cartridge is connected. The training pads cartridge consists of a removable clear protective lid with a handle, a resealable film cover, and a pair of reusable adhesive pads.