Application
App ID: The value is set to the package name (Android) or bundle ID (iOS).
App Name: The value is set to the name of the application.
App Version Code: The value is set to the version of the application.
SDK Version: The value is set to the SDK version of the operating system in which the application is installed.
Device
Advertiser ID: For Android, the value is set to the Advertising ID. SDK versions prior to v4 will always return an empty string. For iOS versions 6 and higher, the value is set to the identifier for advertising (IDFA). For older iOS version the value is set to an empty string.
Device Name: The value is set to the device name of the application (e.g. "Samsung Android", "Android SDK built for x86").
Language: The value is set to the two letter language code that represents the language that the user has set for the device.
OS Version: The value is set to the version of the operating system in which the application is installed.
Platform: The value is set to the platform of the application (either "Android" or "iOS").
Screen Resolution: The value is set to the screen resolution of the device of the application. The format is "width x height", e.g. "1024x768".
Utilities
Advertiser Tracking Enabled: For Android, this returns true if ad tracking is enabled, or false if the user has opted out of interest-based ads. SDK versions prior to v4 will always return false. For iOS versions 6 and greater, the value is set to the advertisingTrackingEnabled property. Otherwise, the value is set to true.
Container ID: Provides the container's public ID (e.g. "GTM-XKCD42-9").
Container Version: Provides the version number of the container, as a string.
Event Name: Returns the event name that caused the trigger to fire.
Random Number: generates a random integer between 0 and 2147483647.