Hardware controls include power, selection and volume up and down, while the smartglasses also gauge 3-degrees of freedom through head-tracking, alongside an integrated compass and GPS. The built-in camera is capable of 1080p video in 16:9 aspect ratio, although it'll be able to capture stills too.
ENGADGET: Vuzix Smart Glasses M100 hands-on at CES 2013 (update: now with video!)