The first thing I learned about these Cardia devices was that the cardiologist doesn't trust them. They are useful to a person because they confirm or refute your feeling that you have atrial fibrillation. Newer 6-channel devices are much more sensitive to electrical interference. I couldn't use mine next to my new fluorescent tubes. I had to prepare everything and then turn off the light in the room. I couldn't use it near my computer's wireless keyboard and mouse. The Kardia device resists for a while and then issues an Electrical Interference message. This gives the user confidence that you have an arrhythmia or not.
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