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The Google Glass prototype resembled standard eyeglasses with the lens replaced by a head-up display. In mid-2011, Google engineered a prototype that weighed 8 pounds (3.6 kg); by 2013 they were lighter than the average pair of sunglasses.
The product was publicly announced in April 2012. Sergey Brin wore a prototype of the Glass to an April 5, 2012, Foundation Fighting Blindness event in San Francisco. In May 2012, Google demonstrated for the first time how Google Glass could be used to shoot videos.
Google provided four prescription frame choices for $225 and free with the purchase of any new Glass unit. Google entered in a partnership with the Italian eyewear company Luxottica, owners of the Ray-Ban, Oakley, and other brands, to offer additional frame designs. In June 2014, Nepal government adopted Google Glass for tackling poachers of wild animals and herbs of Chitwan International Park and other parks listed under World heritage sites. In January 2015, Google ended the beta period of Glass (the "Google Glass Explorer" program).
In early 2013, interested potential Glass users were invited to use a Twitter message, with hashtag #IfIHadGlass, to qualify as an early user of the product. The qualifiers, dubbed "Glass Explorers" and numbering 8,000 individuals, were notified in March 2013, and were later invited to pay $1,500 and visit a Google office in Los Angeles, New York or San Francisco, to pick up their unit following "fitting" and training from Google Glass guides. On May 13, 2014, Google announced a move to a "more open beta", via its Google Plus page.
Article from Wikipedia. https://en.wikipedia.org/wiki/Google_Glass