Details and diagrams for Google Glass just hit the FCC.

The filing — originally discovered by the eagle eyes at Engadget — arrives just days after the first Google Glass Foundry developer event in San Francisco.

Developers at the event were forbidden from talking to the media and had to sign an NDA to participate, so the FCC filing is our best look yet at the technical details behind the project.

The filing is for the Explorer Edition hardware — which is what Google will provide to developers who pre-ordered devices at Google I/O last summer. Certification details for the Bluetooth module included this diagram:

Unfortunately, that's the only image of the actual device in these filings. Google filed a request with the FCC asking for short-term confidential treatment of a number of items, including external photos, test setup photos, internal photos and the user manual. Google's request means that we won't see that information for at least 180 days.

With FCC certification, Google Glass is ever closer to becoming a reality. Let us know your take on the filings in the comments.

Photo courtesy of Mashable, Pete Pachal; Diagram courtesy of the FCC