Developed by Google and run on the Android operating system, Google Glass is a type of wearable technology with an optical head-mounted display. It was developed by Google X, the facility within Google devoted to technological advancements, with the mission of producing a mass-market ubiquitous computer.
Glass presents information in a smartphone-like, hands-free format. Wearers of Glass communicate with the Internet via natural language voice commands. In April 2013, the Explorer Edition was made available to Google I/O developers in the U.S. for $1,500.
Google started selling Google Glass for a limited period in the U.S. in April 2014 before it became officially available to the public in May 2014. Google offers four prescription frame choices, free with the purchase of any new Glass unit. Google also entered into a partnership with Luxottica, an Italian eyewear company and owner of Ray-Ban, Oakley and other brands, to offer consumers additional frame designs.