Try these on for size: Wearable computers -

Overall, "wearables represent a niche industrial and government market where freeing one's hands significantly enhances the capabilities of the user," said David Krebs, an analyst at Venture Development Corp. in Natick, Mass. "We have seen strong successes in warehouses and some in the military for situational awareness, with some adoption in health care and maintenance. But the big issue in the field is identifying appropriate applications."
Most wearables use speech for both input and output, he indicated. The reliability of speech recognition for input isn't a problem, because the voice software is "trained" to recognize a specific user, and the applications generally have vocabularies of less than 100 words, sources said.