The Philips FRX AED is built using the same easy to operate technology as the Philips Onsite, but is made to survive demanding enviorments and 1 meter drops due to it's solid frame construction. The FRx is perfect for first responders who expect heavy usage during the life of the aed device. Choose the FRx Aviation Bundle and this AED is perfect for using in airplanes with it's FAA approved battery.