I was thrilled when my Eko Duo arrived! I can't wait to begin using it! Unfortunately, right now it is completely useless because I was not aware that it does not work with any device other than Apple iOS operating systems. A friend of mine borrowed it and was able to pair it with her Apple phone and showed me the readings. It was really cool! We were not able to print out the ECG reading, but didn't try for very long. The only thing I really need is to evaluate for QT prolongation, so I'm not sure if this device will do that for me or not, espcially since right now it is just a black brick until it can pair with Android phones.