The Philips HeartStart OnSite Infant/Child Training Pad Cartridge can be used on the HeartStart OnSite Trainer (part # M5085A) or the HeartStart OnSite AED (part # M5066A). 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.When the infant/child pads are connected, the voice prompts will be specific for pediatric use just as in a real rescue. 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. A Philips HeartStart OnSite Pads Placement Guide & Instructions for cartridge installation are included with each training electrode set.The trainer electrode cartridge can also be used on a manikin when connect with an internal (M5088A) or external (M5089A) manikin adapter.The trainer electrodes are good for over 30 uses, but if needed, they can be replaced here: (part # M5094A).