Google has shipped over 5 million Google Cardboard viewers since launching the entry-level virtual reality device a year and a half ago, the company announced Wednesday.
The milestone easily makes Cardboard the most popular virtual reality headset on the market — of course, it helps that it’s made out of cardboard and costs as little as $20 to buy. The fold-up cardboard cutout allows users to slip their smartphone inside and use virtual reality apps to immerse themselves in real-world experiences and views, or games.
According to the Google blog, users have installed over 5 million Google Cardboard apps since June 2014 and watched over 350,000 hours of virtual reality videos on YouTube.
Google has also launched a series of site-seeing experiences through its Expeditions program, which uses Google Cardboard to show users important sites around the world including the White House, the Republic of Congo and most recently Buckingham Palace.
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