HeartStart FR3 which is a best professional-grade AED is one of the competitor with Zoll life vest. Both have similar features to certain extent but I feel Zoll Life Vest is a better marketable and comfortable device for patients. The method in which the electrodes are set up in it is so good and it gives a relaxed feel for patients who wear it. It’s similar to a clothing which can be held towards the body firmly and has a stable attachment. But in case of HeartStart FR3 the electrodes are set up directly. This may make the subject feel restless in giving the feel that it might drop down. I am saying in this in the view of being comfortable. We should make a heart patient comfortable and calm even that plays one of the role in preventing the abnormal rhythm. So Zol Life vest is a profitable one.