Eye-Fi is a company based in Mountain View, California that produces SD memory cards and SDHC cards with Wi-Fi capabilities. Using an Eye-Fi card inside a camera, one can wirelessly and automatically upload digital photos to a local computer (running Microsoft Windows or Mac OS X) or a mobile device such as a smartphone or tablet (running iOS or Android). By default, every single picture is wirelessly uploaded to Eye-Fi servers. Some models also allow for uploading photos to photo sharing, blogging and social networking sites such as Flickr, Picasa, Facebook and PhotoBucket; and some models also allow for uploading videos, both to a personal computer or mobile device and to YouTube.
Eye-Fi currently produces three models of WiFi SD cards: "Connect X2" (4 GB), "Mobile X2" (8 GB) and "Pro X2" (8 GB or 16 GB). The older and now discontinued models include "Explore X2", "Geo X2", "Pro", "Geo", "Home/Video", "Share/Video", "Explore Video" and also an "Anniversary Edition". With the exception of speed and storage capacity on the X2 models, every wireless memory card features the same technical specifications and only vary in the additional services provided with it (e.g. "WebSharing", "Geotagging", "Hotspot", etc.).
The upload is via the Eye-Fi server which has full visibility of the photos and the associated user name and password . The server then uploads to the user's storage site and sends the user an email to notify them that the photos have been uploaded to their storage site .
"Share" versions allow uploading to various photo-sharing websites. The "Share Video" card allows uploading videos as well. The "Pro" adds raw image support and peer-to-peer or ad-hoc networking. The "Pro X2" added class 6 read & write speeds, 802.11n and a new feature named "Endless Memory Mode" that automatically deletes images from the card after they are delivered to their intended destination; all of these have since been migrated to the Connect X2 and Mobile X2.
Certain cards offer photo geotagging (WPS) through relationships with Google and hotspot access through relationships with various providers. The location is not locally recorded in conventional Exif coordinate form, but is inserted into Exif upon upload. The Pro X2 ships with both free lifetime geotagging and 1 year of free hotspot access, as did the Explore X2. The Geo X2 offered free lifetime geotagging, but not free hotspot access. Other models can be upgraded (for a fee) to include both features.
Read more about Eye-Fi: History, Technical Specifications of The Eye-Fi Cards, Hardware, Software, Approval in Some Jurisdictions, Currently Supported Photo Services, Awards and Accolades