Hi Teresa, I have an iPhone and actually bought the original Kardia device when they first came out. A few years ago I bought the six lead Kardia but I mostly use it for 2 lead readings. The six lead version has a sensor on the back that you have to place on your knee or ankle then add your fingers on the 2 sensors on the top. I usually take an ECG every morning but rarely get the Normal Sinus Rhythm reading. Most of mine are Sinus with Supraventricular Ectopy (SVE). Even though I use it every day, it hasn't been much help for me. I did show it to my doctor at one of my appointments when I first got it but didn't get much feedback from them. Haven't had any occasions yet to use it when I am having symptoms. Mostly I use it daily as a check to see if I feel any different when it shows an AFIB reading which I get once in awhile but am thinking it's not an accurate reading.