My Doorbell Pro's button broke- what are my options?

I'm learning that there's no replacement piece for the flimsy plastic button that has now compeltely broken and follen off the device. The doorbell still works fine but the button is now weird any many visitors aren't using it. I'm out of the 1-year warranty so is my only option to simply buy a new Doorbell Pro? If I buy the Pro 2 is that a simple replacement over the existing Pro?