Onsite (HS1) Defibrillator


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For the ordinary person in the extraordinary moment, exceptional ease of use in 3 different published studies.
Available without a prescription the HeartStart OnSite Defibrillator is designed with innovative technology, based on extensive research and user feedback, that has produced a defibrillator so easy to set up and use that you can potentially save the life of a co-worker, friend, or anyone else stricken with sudden cardiac arrest.
Weighing just 1.5 kg., this small and lightweight defibrillator can be easily carried to the victim's side.

- Effective. Philips pioneered the use of biphasic waveforms in external defibrillators. The electric medicine delivered by the HeartStart OnSite has been rigorously studied, with more than 40 studies demonstrating high first shock efficacy and effectiveness across the full spectrum of patients. Philips SMART Biphasic therapy uses a unique combination of high current to maximize effectiveness and a lower energy dose to minimize side effects that are harmful to a fragile heart. The result - the HeartStart OnSite delivers its maximum shock strength starting with the first shock.

- Make the most of CPR. Recent studies have shown that CPR is even more vital to survival than previously realized. Yet its benefits dissipate in seconds. Delivering a shock quickly after chest compressions is critical. The HeartStart OnSites Quick Shock feature delivers therapy in just 8 seconds (typical) after chest compressions. Other devices can take 2 or 3 three times that, reducing the likelihood of shock success, and potentially, survival.

- Give your early defibrillation program the best chance for success. The HeartStart OnSite Ready-Pack configuration arrives to you virtually ready-to-rescue out of the box, with device pre-installed in carry case, and battery and pads pre-installed in the device. The Ready-Pack is designed to be the simplest-to-deploy AED, giving you the peace of mind that it is deployed correctly, with less effort. The simple and welcoming set-up and maintenance instructions are designed to take the intimidation out of owning a defibrillator.

With HeartStart AED Services Program Management (available in the US), Philips experts can draw on a wealth of experience to help you get your program started on the right foot, with pre-implementation consulting and site assessments. We can help manage your everyday needs, including medical direction from a licensed physician, AED/CPR training, web-based program management, and case management software.


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Product Specifications.

Defibrillator Number
HeartStart M5066A
Defibrillator Family
How Supplied
Defibrillator, battery (one, preinstalled), SMART Pads (one, preinstalled), Set-up/Maintenance guide with expiration date tags, Owner's Manual, Quick Reference Guide. HeartStart Onsite (HS1) Ready-Pack option R01: Defibrillator inside carry case, battery (one, pre-installed), SMART Pads (one set pre-installed plus spare set in carry case), Set-up/Maintenance guide with expiration date tags, Owner's Manual, Quick Reference Guide.
Truncated Exponential Biphasic. Waveform parameters adjusted as a function of each patient's impedance.
Adult defibrillation peak current: 32A (150J nominal) into a 50 ohm load. Pediatric defibrillation (with optional Infant/Child SMART Pads Cartridge): 19A (50J nominal) into a 50 ohm load.
Shock-to-Shock Cycle Time
Typically less than 20 seconds between shocks in a series.
Quick Shock
Able to deliver a chock after the end of a CPR interval, typically in eight seconds.


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AED Design: How Ease of Use Happens
In every work area of our Seattle, Washington facility, there is a sign with our commitment to customers. "We design and produce every device as if the life of someone we love depends on it".

That promise is deeply heartfelt by every employee. A major way of meeting this commitment is by designing our AEDs to be as easy as possible to use by inexperienced responders under considerable stress. To help make the responder successful, the defibrillator must pull the lay-responder through, not get in their way. In fact, in three different published studies, a Philips AED was unsurpassed in ease of use. Here are some of the design elements that result in an easy-to-use AED.

Extensive user testing.During design, a HeartStart device's human factors are tested and refined over and over again, using ordinary people put in simulated cardiac arrest situations. They are videotaped interacting with the device, and studied carefully. Every point at which a user is unsure or confused is considered a design flaw for the device's user interface. This practice uncovers a host of potential pitfalls and dead ends in device use that signal a potential failed rescue, and are designed out of the device before bringing it to market.

The right voice. The voice you hear giving instructions from our defibrillators is carefully chosen to have just the right blend of attributes:

  • Calming. So they can think clearly and build confidence in their ability to respond coolly and competently.
  • Building a rapport with the rescuer-We prefer a voice the responder will naturally "like", to form an effective team of responder and device.
  • Commanding. People have difficulty making decisions under stress. So the voice we choose should inspire the responder to put their trust in the device, pay full attention, and do exactly as instructed.
  • Culturally attuned. Voice talent for our various language devices is chosen locally, in-country, to capture the above attributes in a way that is faithful to the culture in which the device will be used.

Detailed instructions, yet not wordy. Voice instructions are designed to be sufficiently detailed to take an untrained user through a rescue. This is a foreign and frightening experience for the responder. So voice instructions should make sure nothing is left to chance. Yet sentences should be short, with no unnecessary words that do not contribute to understanding. It is our experience that long sentences potentially cause confusion and frustration for a stressed responder.

Instructions paced to your actions. Voice instructions are designed to move along at the user's pace. They should not outpace the user, leaving them behind, anxious, and lost. And they should not slow the responder down, wasting valuable time, and tempting them to "go it alone", acting before being instructed, and possibly acting incorrectly. HeartStart defibrillators are uniquely able to know where the user is in the response and closely pace instructions accordingly. The pads of the HeartStart FRx and OnSite (HS1) can sense when they are being manipulated. This helps the AED know more precisely than other AEDs where the user is in their response. The device will adjust instructions accordingly to provide instructions appropriate to the user's progress. This makes for a more human interaction between user and device, like there is a coach watching over them and guiding them step by step.


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