Each RoadWarrior account comes with a free Basic subscription that allows you to save as many Routes and Favorites as you’d like, but they’ll only be accessible from the device you created them on.
Pro subscribers can access data and Routes across devices (aka, sync their data). This allows you to, for example, create a Route on one device and use a different device to navigate.
You can access your account on up to 2 devices at a time. You are always welcome to add additional devices, just know this deletes your oldest active device, and places an 8-hour hold on your account adding additional devices.