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UWB -- short for ultra-wideband -- is a low-energy, short-range radio technology that's been around for a couple of decades (it went under the name "pulse radio" for a while).
UWB makes use of super-fast signal pulses (anything up to over a billion a second) broadcast across a wide swathe of the radio spectrum (from 500MHz to several gigahertz). This allows it to avoid the interference issues that plague other technologies, such as Wi-Fi and Bluetooth.
Up until recently, UWB has been limited to mostly military and medical applications.
But that's changing.
While there was a point when it looked like UWB could replace Wi-Fi (that didn't happen), and that Apple might be planning to use it to replace Bluetooth for communicating with AirPods, the feature of UWB that's made it mainstream is precision finding.
The low-energy aspect of UWB means that a small button-cell battery can last a year in a tag, while the precision finding feature means you can narrow your search for lost possessions down from a few hundred feet to a few inches.
Not only is it more accurate than GPS, but it also works indoors as well as outdoors.
And in the Apple ecosystem, everything just works.
Well… sort of.
There is one exception here, and that's the latest-generation iPhone SE. For some strange reason, Apple didn't include UWB support here. Bit of an oversight if you ask me, and I hope that the next-generation iPhone SE will change this.
Now, tags are one thing. You can take them or leave them, but UWB is gaining traction in other areas.
One of those uses is as a digital "key" for your home or car. Imagine the convenience of being able to walk up to your car or front door, and have it detect your approach and automatically unlock for you.
Well, if you're an iPhone owner, things are golden as long as you've bought a new handset in the last few years, and that iPhone wasn't the iPhone SE.
But for you Android users, things are messier.
You're not only left to figure out if your smartphone supports UWB, but you also need to figure out how to turn it on if it does.
My guess is that things are going to get better over the next few years, but it could be a long time until UWB makes it to budget Android devices.