Google Glass’ papers have arrived at the FCC, according to filings posted Thursday. The headset, likely the Explorer edition promised to developers at Google I/O last year, includes an 802.11 b/g 2.4 GHz WLAN, a low-energy Bluetooth 4.0 radio, and—if one sentence and a corresponding patent are to be believed—a “vibrating element” for transmitting sound to the user’s head via bone conduction.

Google filed a patent for a headset that uses bone conduction audio, which was granted only a week ago. The audio would work similar to that of certain children’s toothbrushes: a vibration transducer vibrates the bones in the user’s head, which translate the vibration to the cochlea, the fluid-filled cavity inside the ear, which then reads the vibrations as sound. The technology is already used in many headphones, with the advantage that such sound can be clearer than it is from the tiny speakers that are in earbuds.

In its FCC filing, Google makes only one mention of a “vibrating element” in the headsets, wherein a video stored within the headset plays and transmits audio via vibration. The video test was conducted as part of testing the Bluetooth Low Energy mode. Google has also indicated plans for user input to the headsets, including number pads projected onto surfaces and gesture interpretation from the headset’s camera.

Google co-founder Sergey Brin stated shortly after the 2012 Google I/O that ideally the company would get the Glass headsets into developer hands “early” this year. Google has already held one developer conference this past week in San Francisco, and a second conference is currently in progress in New York.