[deerIRL]

Bluetooth. I think AirTags will most likely use some combination of bluetooth and the new U1 chip included in the iPhone 11 Pro which should hopefully give it more granularity than a plain old bluetooth tracker would.

[judge2020]

The ultra-wideband U1 chip is going to be the main push behind AirTags. As I understand it, with 3+ devices close to each other, you can pinpoint the exact location of any of the other devices, so I imagine there will be an app for finding your AirTags in AR by moving your phone's camera around.

[deerIRL]

I really hope this is the case. The biggest issue I always have with the trackers is the granularity just doesn't seem to be fine enough.

Mind you I have never tried Tile, so they may be better in that regard, but there is only so much you can do off a single bluetooth signal

[slimsag]

I've tried Tile, it'll tell you if it's within 15-20 feet and then has an audible noise. Kinda OK, but not great.

[Fnoord]

Does this also allow other people to locate your device(s) easier?

I was thinking of Tesla Radar [1] which allows people to track Model 3 via Bluetooth (cannot be disabled by user).

[1] https://www.teslaradar.com/

[donarb]

It also uses Apple's anonymizing tracker functionality so that any iPhone that is near the lost tile can report it's location back to the owner.