Then there is Vuzix and its M100 glasses, an impressive Google Glass knockoff. The M100 headwear is a hands-free "smartphone display and communications system." It's equipped with GPS, has a built in hi-def camera, and is optimized to be tethered wirelessly to an Android or iOS smartphone. The Vuzix M100 can also juggle apps that include texting, video, e-mail, mapping, and audio. Paul Travers, Vuzix's CEO, says the M100 is "ready for full-scale launch this summer." Vuzix's M100 has a two hour battery life with the display turned on, but half that with the camera and display both on. Pricing is unknown.