In order to report revenue and conversion data by device, a dynamic device parameter (i.e. Google's {device} ValueTrack parameter) must be appended to your destination URLs.
Setting up a separate device parameter name-value pair is the recommended approach used to append device type information to URLs.
Here is a step-by-step guide to setting up your device parameter tracking ID:
Note that '{device}' will be substituted with an 'm' for mobile clicks, 't' for tablet clicks, and 'c' for desktop clicks when served by the publisher. To learn more about Google's {device} ValueTrack parameter, see Google's Guide to Using ValueTrack.