Very pleased with EKGraph. I am being treated for AFIB and it very difficult to detect via any of these devices. However, I take my EKG every morning and anytime I feel it may be required. I can can see just how irregular my heartbeat is and if I should be concerned. It is very easy to use and it gives me some peace of mind. I have only charged the unit one time but it has lasted several weeks. I highly recommend this product, especially when other mfgs require a subscription fee to share results with your doctor.