Upgrade to Ring 2.

I am contemplating upgrading my Ring doorbell to a Ring 2, but have a couple of questions:1. I use a power supply with the 25 ohm resistor to power the ring. Will this power the ring 2 and would I leave the resistor in place?2. If I installed the first Ring to my black door would I be able to power both with the same power supply?3. If I have both rings operational, can I have them both sending alerts to one chime?4. Can both Ring doorbells be connected to Alexa? How about multiple Alexa's?thanks