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Once the formalities of the press previews and warm-up events are out of the way, CES 2015 finally kicks into life when the show floor opens up.
Las Vegas is no stranger to huge conferences, but CES is in its own league: an estimated 160,000 attendees will turn up, keen to see the 50,000+ exhibitors on show.
It's impossible to see everything, but our reporter Leo Kelion slipped on his most comfortable shoes in an attempt to capture as much of the action as possible - you can follow him on Twitter @LeoKelion.
To get a flavour of the rest of the show, we've included some of the best shots from some other sources too.