Google has started selling its computer in a pair of glasses in the United States, even though the gadget is officially still being tested.
Google Glass costs the equivalent of almost 1,100 euros and anyone in the US can buy the development version as long as stocks last.
The company did not specify how many glasses would be sold or whether it would make any more once they were sold out.
Up till now they have only been available to a select group of users such as developers of apps.
The consumer version, with Improved hardware and software, is expected to go on sale to the general public toward the end of this year.
With a tiny electronic screen mounted on the frame, the device can record video, and retrieve information from the web connected wirelessly to a mobile phone.