Machine arrived 3 days earlier than predicted. I was in the hospital recovering from heart ablation surgery. As expected, I was given numerous EKGs. My wife brought the machine to the hospital and in less than 5 minutes I knew the basics. I began giving myself an “EKG” and comparing the results with the hospital’s and it matched every time! Prior to ordering it, I asked my cardiologist his opinion. His words were tight on. “It is limited in what it can do, but surprisingly accurate.” I would recommend it to any who suffers from A/Fib without hesitation! By the way, I had bypass surgery 20+ years ago and have suffered with A-Fib for years off and on and constantly the past 6 months. Ablation surgery was a success and I’m in my third day of normal heart rate and rhythm. Chris Eulberg Meeker, Oklahoma