This report shows the traffic to your site from visitors utilising a mobile device.
In particular, the "Mobile Traffic" report allows you to compare the trend of the main metrics by visitors using a desktop device (tablet or smartphone).
It shows the following metrics:
Page views from Mobile Devices
Visits from Mobile Devices
Daily unique visitors from Mobile Devices
New visitors from Mobile Devices
Average time spent per page from Mobile Devices
Average time spent on the site from Mobile Devices