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Philips offers two popular options of AED with the Heartstart line- the Onsite and the FRx.

Both the Onsite and FRx are available as semi-automatic models. With an automatic model, there is no button to administer a shock. The AED will analyze the patient’s heart rhythm and administer a shock if viable. In a semi-automatic model, the AED will analyze the patient’s heart rhythm, and if appropriate to shock the patient, the device will light up a flashing button to be pushed by the rescuer, which will then administer a shock. Both options are excellent choices and choosing automatic vs. semi-automatic is a matter of preference.

All AED pads contain an adhesive gel coating, which allows the pads to stick to the surface of the patient’s skin, and this also conducts the shock being transmitted. Due to the possibility of this adhesive gel drying out in the long term, all pads come sealed in a package and have an expiry date. The pads for both the FRx and the Onsite have a 2-year shelf life.

Pediatric pads do not typically come equipped with the Onsite but are available to purchase separately. Pediatric pads are recommended to be used on individuals less than 8 years old, or under 55 lbs. The FRx has a unique design and does not require separate pediatric pads. A small key is available to be purchased and can be inserted into the FRx to switch it over to child mode, which will regulate the shock administered to the patient. The Infant/Child key may be purchased and stored with the device but should not be kept installed in the key slot.



Batteries in AEDs have a limited life span due to the fact that they run frequent self-checks and the need to maintain enough charge to deliver multiple shocks in an emergency. Both the Onsite and FRx have batteries with a 4-year standby life, which means the battery will expire exactly 4 years after being installed in the device.

All Philips AEDs run self-diagnostic checks daily, weekly and monthly. There is a green indicator light which will flash if the device is in proper working order. If the device detects any issues, the indicator light will stop flashing. If this should happen, please consult the user manual in order to troubleshoot.

When registering with the Heart Safe AED website, you will enter important information into the database such as battery and pad expiry dates, so you can easily track when they will need to be replaced.

These devices also feature data download options, as the device records heart rhythms and other valuable data when it is being used. This data can be downloaded onto a computer and utilized by First Responders and Medical Professionals to determine the nature of the issue and assess treatment options. Please refer to the manufacturer’s website below to find out more.

HeartStart AED Solutions (

The Philips Heartstart FRx and the Onsite are priced between $1500-$1700, depending on the supplier. Consider the cost and frequency of replacement pads and batteries when evaluating AED purchase options.

If you are looking for replacement accessories, please contact your AED supplier, or refer to the supplier list listed on our Heart Safe Website.

If you have any questions regarding AED usage, registration, Sudden Cardiac Arrests or more, please contact the Heart Safe Public Access to Defibrillation Program!


Phone: 1-866-786-1440

Calgary, Alberta, Canada