Big trends to follow at biggest tech show: CES

Imagine this: When you leave the house, your air conditioner and lights turn off automatically. Then when a motion sensor detects a person in the house, like your house cleaner, and it sends an alert to your phone. When you arrive home, a camera recognizes who you are and the door automatically unlocks. Automated technologies like these will be at the forefront of CES, one of the world's largest tech conventions, this week in Las Vegas. They underline one major trend: Increasingly, the innovations that are making their way into your personal technology aren't physical electronics or gadgets at all.