Philips Heartstart AEDs are the No. 1 selling AEDs currently on the market today. While the Philips OnSite AED is optimal for office or home use, the Philips FR3 is a professional model meant for more experienced AED users. The Philips FRx features the option for a pediatric key as opposed to needing pediatric pads making it ideal for schools. This FRx feature can cut downon time when performing a rescue. All Philips Heartstart defibrillators deliver a quick shock within eight seconds. The Philips OnSite AED and the Philips FRx AED both have 8-year warranties while the FR3 has a 5-year warranty.