Philips HeartStart FRx Infant Child Key

Most new Philips FRx purchases from authorized distributors include the Infant/Child Key as part of the kit, but always confirm at order time. Some lower-priced FRx bundles strip the Key to hit a lower price point. The Key itself costs ~$110 if purchased separately. If your facility serves children, verify the Key is included before completing purchase. The Key has no expiration date, so once you have one per device, you’re done with that consumable forever.

If a child is the patient and you’ve lost the Key, AHA guidance is to proceed with the FRx in adult mode rather than skip defibrillation. Survival math favors the rescue attempt with imperfect dose over no defibrillation. To prevent this scenario, tether the Key to the cabinet with a short lanyard, store a spare Key in the cabinet pouch, or buy a backup Key for $110. For multi-AED facilities, audit every cabinet quarterly to confirm Keys are present and accessible.

No — the Infant/Child Key is mechanically and electrically designed for the FRx only. The Key slot doesn’t exist on the OnSite or FR3 chassis. For pediatric mode on the OnSite, you must swap to M5072A pediatric pads. For the FR3 (clinical / EMS use), pediatric energy adjustment happens through the device’s own controls. Cross-device accessory compatibility doesn’t exist in the Philips line — each model has its own pediatric workflow.

The FRx Child Key wins on long-term cost by a wide margin. The Key is a one-time ~$110 purchase with no expiration, while M5072A pediatric pads run ~$95 per pair on a 2-year cycle. Over an 8-year warranty period, FRx Child Key total cost = $110. OnSite M5072A total cost = ~$380 (4 cycles at $95). For schools, daycare, and any K-12 facility with multiple AEDs, the Child Key economy is one of the strongest cost arguments for choosing FRx over OnSite.