You can control which devices your tactic targets.
If your tactic should run only on desktops, phones, or tablets (or a particular combination of those, like desktops and tablets), select the types you want.
Select the browsers that your tactic should run on.
Mobile Advertising IDs (IFAs)
In lieu of cookies, iOS and Android provide a mobile advertising identifier (IFA) for advertising tracking purposes in mobile apps. This identifier is called IDFA on iOS and Google (or Android) Advertising ID on Android. If the availability of an IFA is important for your campaign, select Only target device impressions that contain an IFA.