KardiaMobile 6L is the world's first personalized ECG device. It is capable of recording two kinds of EKGs: a single-lead ECG and a six-lead ECG. This provides more data for you to share with your doctor. Both ECG types detect normal sinus rhythm, atrial fibrillation, bradycardia, tachycardia, and indeterminate results (errors or unclassified rhythms). KardiaMobile 6L has two electrodes on the top surface and one on the bottom surface. It is powered by a replaceable battery, which is located under the bottom electrode. Bluetooth is used to wirelessly transmit the ECG data from the device to your smartphone or tablet.