CES 2014: The smartwatch that can make phone calls
10 January 2014 Last updated at 11:35 GMT
Over the past year technology companies have tried numerous ways to make smartwatches communicate with our phones.
But Canadian start-up Neptune has gone one step further, putting the entire Android mobile operating system on a "watchphone", which can also double up as a helmet camera.
The BBC's North America Technology Correspondent Richard Taylor took it through its paces.