The Multichannel Esophageal ECG recorder was developed as a long-term recording diagnostic device to overcome the limits of normal surface ECGs in the detection of arrhythmias. The surface ECG is a non-invasive device used nowadays by cardiologists as a method of first screening in case of arrhythmias that are difficult to diagnose if not periodical. The limitations of this technology can be caused by irritation of the electrodes on the skin or lack of sensitivity to P waves. Against this background, the device designed by the research team at Institute for Human Centered Engineering HuCE (Bern University of Applied Sciences BFH) has proven to be more sensitive to arrhythmia detection.