Lifeline is the simplest AED to use and has been designed by physicians so that non medical personnel can save a life.Semi-automatic - Once the pads have been placed on the patient, the machine will check to see if defibrillation is needed and if so, prompt the user to push the shock button.Durable yet lightweight with a sure-grip handle.Battery life of up to five years delivers approximately 125 shocks or works continuously for around eight hours.Comes with standard capacity battery set H x W x D: 300 x 220 x 70mm.