As a veterinarian, I can say that AliveCor can also be used for animals - there are even studies about it. From cats to dogs and horses, everything is possible. It's not a complete diagnostic ECG, but it's certainly a good thing to have as an animal owner - if indicated and in consultation with your vet - to monitor your animal's heart rhythm or heart rate. The ECGs can be sent to the vet for evaluation. Many vets also use the AliveCor themselves as an emergency/second ECG device (or even as a low-cost primary ECG device if the purchase of a professional device is not worthwhile for a practice).
I also suffer from AFIB and found this device to be extremely sensitive to external interference - to the point that I no longer use the device. I got a successful reading perhaps one time in ten. I never identified the source of the interference so abandoned the device.
The device only records the heartbeat and forwards it to the smartphone. It does nothing else. Don't need it any more. Broke down. Besides, I now have a smartwatch that can do that on its own.
Well, a sure instinct is required, of course. I did it like this:
Warm the lid slightly (i.e. 40 degrees) so that the plastic becomes a little more pliable (but not too much), then insert one side and press the other in with the end of a spoon.
Hello, no, you can attach it there (the holder) so that you can carry the device around more easily. But for the actual operation, it is best to place it directly in front of the mobile phone on the table.