During Google's developer conference, Google I/O, in May 2013, the company announced that, on Google Chrome and Chrome OS, users would be able to say "OK Google", with the browser initiating an audio-based search, with no button presses required. After having the answer presented, users can follow up with additional, contextual questions; an example include initially asking "OK Google, will it be sunny in Santa Cruz this weekend?", hearing a spoken answer, and reply with "how far is it from here?" An update to the Chrome browser with voice-search functionality rolled out a week later, though it required a button press on a microphone icon rather than "OK Google" voice activation.  Google released a browser extension for the Chrome browser, named with a "beta" tag for unfinished development, shortly thereafter.  In May 2014, the company officially added "OK Google" into the browser itself; they removed it in October 2015, citing low usage, though the microphone icon for activation remained available.  In May 2016, 20% of search queries on mobile devices were done through voice.