a medical doctor exactly it is designed for people philemon who have no medical training so you just switch it on it will start to talk to you as well as it direct you through all the steps you have to take so much to do is just present the green button here exactly green button to activate and then there are those patches here they have this painting that illustrates where to put them and then put it in here there's a little yellow limb exactly and it talks to you actually it does it in a sense what you have to do you know it instructs through to press the blue button the blue button yes. and now the device analyzes the heart the right or the electricity ok at the heart so that we don't do any chest compression right now right now we just don't touch the person as instructed. it determine that this patient needs to be shocked ok and so it directs you in this case yeah you press the red button ok once you have made certain that no one is touching the patient