Eyefi Center is the principle application for activating and managing the settings of X2 cards. If you have a Mobi card, you do not need to download this application. Eyefi Center will be the initial place that you setup your card, and is required to setup Direct Mode for Android or iOS.
Eyefi Center for Windows (XP, Vista, 7, 8) and Mac OS X (10.5 through 10.10)(X2 cards only)
Eyefi Center consists of two parts: a small application (Eyefi Helper) that runs on your computer and a graphic interface application (Eyefi Center) that runs independently of a web browser or internet connection. Version 3.4.26 (Windows) or 3.4.35 (Mac).