In case the Russians invade 

Security outfit Ring has been showing CES the wonders of having your house protected by a flying drone.

Health monitoring, but not the part of your body you might think

Happy Health has released a ring which it says measures your sleep, stress, and ultimately mood. The company says this simple ceramic and resin band can capture brain signals from the peripheral nervous system and translate them into real-time, measures of mood state.

One billion dollars

Amazon literally wants to enter into your house and now it controls the front door too.