The Halo WX is a new smoke detector that doesn't just detect smoke and carbon monoxide, but can also warn you if there's a natural disaster threat.
You might ask yourself what the value is in having a smoke detector that can warn you of natural disaster threats when you already use the Internet and have a smartphone. But remember that during disasters, cell phone signals often die and power goes out. So say you're stranded in your home in the aftermath of a tornado -- your Halo WX might be able to let you know if it's safe to venture out or if you should stay home because there's another tornado on the way.
This new smoke detector shows that adding unexpected functionality to already-existing tech products is a great way to make them more appealing and useful.