Canon LBP7210Cdn Manual page 204

By obtaining information from the printer, you can display the current printer status and printer information in the
Remote UI.
To check the printer status, select [Status] or [Features] from the [Device Manager] menu.
[Status] Page
You can check the statuses of the paper sources and toner cartridges or other information.
[Features] Page
You can check the availability of the optional accessories and the total number of the printed pages.
[Status] Page