This is where you might wish to know more about what he/she knows. Obviously, something is amiss. Your heart is showing signs of an electrical disorder that is causing at least premature atrial complexes, maybe some supraventricular tachycardia, maybe some ventricular problems....and he/she thinks that you should have more frequent monitoring than what you can get with an office visit.

The device is commonly called a loop recorder. They are commonly used for short periods, sometimes longer when the need is great, to develop a continuous and lengthy data-set of one's cardiac electrical activity. They don't get implanted unless there is sufficient concern and urgency that not knowing their output might put you at unnecessary and unacceptable risk of mortality, or maybe only permanent heart damage.