Updated · July 2026
Most pages sell the FRx on its ingress rating and move on. The rating matters, but it is not the reason to choose this device. The reason is that one pad set and one physical key cover every patient from infant to adult, which removes the most common pediatric-readiness failure: the separate child pads nobody bought.
Our verdict
Philips HeartStart FRx
Buy it when the AED will be handled hard or used on both adults and children. The Infant/Child Key switches the same SMART Pads III to pediatric energy with a physical insert, so there is no second cartridge to buy, date, or forget. The body is IP55-rated and built to keep working after drops and dust that would retire an indoor unit.
Do not buy it for CPR coaching. Like the OnSite, it guides by voice but does not measure compression depth. If depth feedback is the priority, the ZOLL AED Plus measures it and says push harder. The FRx wins on durability and pediatric simplicity, not on feature count.
The Infant/Child Key: one pad set, every patient
On most AEDs, treating a child means a second, separate pad set with its own price and its own expiry date. That second consumable is the thing sites forget to buy, and the gap only surfaces during a pediatric emergency.
The FRx removes the gap. A single physical Infant/Child Key inserts into the device and reconfigures the same SMART Pads III to deliver a lower pediatric energy dose.[6] One pad set, one expiry date, both populations. For a K-12 school or a mixed-age facility, that is one fewer thing to track and one fewer way to fail.
The tradeoff is that the FRx, like the OnSite, does not measure CPR depth. If your priority is a single-set pediatric solution that also reports readiness to a fleet dashboard, the ZOLL AED 3 covers both on one Uni-padz set with WiFi. The FRx answer is simpler and rugged, not connected.
Specification
| Attribute | HeartStart FRx | What it means for you |
|---|---|---|
| FDA status | FDA-approved via Premarket Approval[1] | Verify PMA family for your variant in the FDA database[2] |
| Pediatric method | Infant/Child Key, one pad set | No separate pediatric cartridge to buy or date[6] |
| Durability | IP55, drop and drive-over resistant | The rugged Philips. Built for the field, not just the wall |
| Guidance | Life Guidance voice prompts, step by step | Built for the untrained responder. Calm, plain-language coaching |
| CPR feedback | Voice prompts only, no depth or rate measurement | It tells you to compress. It does not tell you to push harder |
| Pads | SMART Pads III, pre-connected | Can be placed and left on the patient. One consumable to track |
| Weight | ~3.5 lb | Light enough for a response bag or a wall mount |
| US price, July 2026 | $2,099 | Higher than the OnSite for the rugged body and the key |
Confirm the current PMA record and labeling for your exact variant in the FDA PMA database[2], and check the model against the FDA recall database[4] before purchase, particularly on a used unit.
New or recertified: where the entry cost drops
The FRx is one of the most common models sold in recertified condition, so the used route is a real way to put a rugged, pediatric-capable Philips in place for less. A recertified unit is inspected, tested, and fitted with fresh consumables, not a private-sale gamble.
A new FRx lists at $2,099. A recertified FRx typically runs several hundred dollars less, which matters most for a school district or a multi-site buyer placing several units at once. The variables are warranty length and consumable dating, which differ by seller, so confirm both before you buy.
If you are weighing the used route, read the best refurbished AEDs guide first, then confirm what is replaced and how long the warranty runs. For a fleet of schools it is the fastest way to cover more sites on the same budget.
The five-year cost
Device (US price, July 2026) ……………… $2,099
SMART Pads III, ~2 yr life ………. 2 replacements
Battery, ~4 yr life …………….. 1 replacement
Pediatric pads ………………… $0 · Infant/Child Key uses the same pads
Consumable events over 5 years ….. 3
Philips OnSite, same window
Device (US price, July 2026) …………….. $1,589
Pediatric cartridge …………….. separate, prescription, if children present
Consumable events over 5 years ….. 3, plus a second pediatric SKU
Labeled estimate. Replacement counts use ceil(years ÷ component life) − 1 and assume no deployment. A real rescue consumes the pads immediately, so budget a spare set regardless of model. Run your own numbers in the AED cost calculator. Ongoing parts: AED pads and AED batteries.
The FRx costs more up front than the OnSite, but for a site with children it can cost less to keep compliant, because there is no separate pediatric consumable to buy and re-date. On adult-only indoor sites that advantage disappears and the OnSite is the better value.
Who should buy it, and who should not
Buy the FRx if
- Children are present. One pad set plus the Infant/Child Key covers every patient. Size a district with the quantity calculator and see the schools guide.
- The AED takes abuse. IP55 and drive-over durability suit gyms, worksites, vehicles and response bags. See the gyms guide.
- Responders are untrained. Voice guidance and pre-connected pads make it easy to use correctly the first time.
- You want Philips reliability in the field. Same voice guidance as the OnSite, in a body built to survive.
Buy something else if
- The site is a quiet indoor office. The Philips OnSite does the same clinical job for $510 less, and buys over the counter with no prescription.
- You want CPR depth coaching. ZOLL AED Plus measures depth. The FRx only prompts.
- You manage a fleet remotely. No connectivity here. ZOLL AED 3 and the LIFEPAK CR2 report readiness by WiFi.
- Budget is the only constraint. The HeartSine 350P is the lowest entry price at $1,411.
How it compares
| Model | Pediatric method | Durability | CPR guidance | US price, July 2026 |
|---|---|---|---|---|
| Philips FRx | Infant/Child Key, one set | IP55, rugged | Voice only | $2,099 |
| Philips OnSite | Separate Rx cartridge | Indoor | Voice only | $1,589 |
| ZOLL AED 3 | One Uni-padz set | Indoor | Depth + rate | $2,399 |
| HeartSine 350P | Separate Pediatric-Pak | IP56 | Metronome | $1,411 |
| ZOLL AED Plus | Separate Pedi-padz II | IP55 | Depth + rate | $2,082 |
Cross-shopping Philips: FRx vs OnSite comes down to environment and pediatric need. Considering used: best refurbished AEDs. Full lineup: Philips brand hub and the AED brands hub. New to this: AED buyer’s guide. Environment picks: AEDs by industry and the schools guide.
Sources
- FDAUS Food and Drug Administration. “Automated External Defibrillators (AEDs).” fda.gov
- FDAUS Food and Drug Administration. Premarket Approval (PMA) database. accessdata.fda.gov
- Federal Register“Effective Date of Requirement for Premarket Approval for Automated External Defibrillator Systems,” 2015. federalregister.gov
- FDAUS Food and Drug Administration. Medical Device Recalls database. accessdata.fda.gov
- AHAAmerican Heart Association. AED Implementation Guide. cpr.heart.org
- ManufacturerPhilips. HeartStart FRx product documentation, Infant/Child Key and SMART Pads III specification. philips.com (manufacturer source)
Editorial content only. Not medical advice. Durability, Infant/Child Key and pad performance claims are the manufacturer’s own, cited above and labeled as manufacturer documentation. Specifications reflect manufacturer and distributor documentation current at publication; confirm the PMA record, labeling and recall status of your exact variant and package before purchase. Prices are 2026 US list at authorized distributors and change without notice. Cost figures are labeled estimates, not quotes.
