The only hard requirements are a good headset and decent Internet. And when I say "decent," I don't mean "fabulous." I worked remote for five years, three time zones away from headquarters, and never even thought of getting a mobile-connected smart whiteboard. It might have been nifty, but it's by no means a requirement.

The main requirement is that everyone communicate over the same channels. No planning sessions at the watercooler. Take it back to your desk and have the conversation in Slack instead.