My Sitecore site has a rule to determine if the mobile version of the web site should be shown. Can anyone explain to me in detail what exactly is happening with this rule? Is there a DLL involved? Is this something that comes with Sitecore out of the box? Is this using 51Degrees somehow?

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I found this DLL reference:

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The Screen Width Rule Element for Device Detection points to:

Sitecore.SharedSource.MobileDeviceDetector.Rules.Conditions.ScreenWidthCondition, Sitecore.SharedSource.MobileDeviceDetector
  • Find those conditions in content tree. In Sitecore 8 they are under /sitecore/system/Settings/Rules/Definitions/Elements/ node. Their items will show you what code is used by them.
    – Marek Musielak
    Commented Oct 11, 2016 at 11:44
  • Sitecore.SharedSource.MobileDeviceDetector.Rules.Conditions.ScreenWidthCondition, Sitecore.SharedSource.MobileDeviceDetector
    – ADH
    Commented Oct 11, 2016 at 12:05

1 Answer 1


You're using Mobile Device Detector module from Sitecore Marketplace ( https://marketplace.sitecore.net/modules/mobile_device_detector.aspx ).

Yes, it's using FiftyOne.Foundation.dll and some extra code for rules above it.

There is additional processor added to the httpRequestBegin pipeline called DeviceResolver which tries to resolve what device is used.

And ScreenWidthCondition uses HttpContext.Current.Request.Browser.ScreenPixelsWidth to determine screen value so it's not really related to anything Sitecore specific.

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