The software is the key...provides pdf files that can be printed, emailed to physician. saved to your device, your cloud storage or to Livecorp cloud under monthly contract which also provides monthly summaries.
I have the Kardia 6L, capable of 6L data recording...because of paroxysmal atrial fibrillation, an elusive bastard arrthymia to record because it comes and goes. Hard to discover in Dr. office or ER. Now I can catch it in real time for diagnosis. Amazing...the single lead is under $100, the 7 lead $150 about same size. Self contained battery with 3 yr life and can be replaced. No charging cords. It fits into a spare tri-fold wallet along with a USB C phone charging cord.
There's also a joint venture integrated product with Omron that takes blood pressure and EKG with wireless transmission to smart phones, using essentially the same software app.
I’m glad all this is so easily available to you folks who need it. I can only wonder what amazing things will be available in 5 or 10 yrs.