The Philips Heartstart defibrillator can be used on adults, children, and infants. A clear-voiced narrator guides the user through each and every step. Weighing only 3.3 lbs., it can be transported to the patient easily and quickly. The unit completes a series of self-tests, including a pads integrity test to make sure the cartridge was properly installed. Each unit includes 1 pair of adult defib pads and 1 four year battery.