Google Glass displayed information in a smartphone-like hands-free format. Wearers communicated with the Internet via natural language voice commands.Google started selling a prototype of Google Glass to qualified "Glass Explorers" in the US on April 15, 2013, for a limited period for $1,500, before it became available to the public on May 15, 2014.The headset has received massive criticism and legislative action due to privacy and safety concerns. On January 15, 2015, Google announced that it would stop producing the Google Glass prototype but remained committed to the development of the product. According to Google, Project Glass was ready to "graduate" from X, the experimental phase of the project.