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The tags themselves are nice and slim, about the size of a quarter and only a few millimeters thick. They tuck away easily in my wallet or stick on my keychain without adding too much bulk. The included silicone cases are a nice touch for added protection.
When I'm within Bluetooth range (about 200ft according to the specs), I can make the tag play a little tune to help me pinpoint its location. The speaker is surprisingly loud for such a tiny thing - I could hear it chirping from a few rooms away!
If the tag is out of range, the app will show the last known location on a map. It's not always super precise (seems to depend on how many other Apple devices are nearby), but it gets me in the general vicinity. The "left behind" alert is handy too - it pings my phone if I walk away without my tagged items.
One thing to note - these tags only work with Apple devices and the "Find My" network. Sorry Android folks, you're out of luck here. And while the encrypted anonymous location data is a nice privacy feature, it does mean you can't track your items through a web browser or share access with friends/family.
Battery life has been solid so far - been using them for a few months and the app still shows 90% charge. The replaceable battery is a plus, though I haven't had to swap it out yet.
My biggest gripe is with the adhesive on the silicone cases. It's just not very strong. One of the tags fell off my laptop bag within a week. Ended up reinforcing it with some double sided tape, but it's worth noting.
So yeah, these item finders have been a mostly positive experience for me. They're not perfect - the adhesive could be better and the location tracking can be hit or miss - but overall they've saved me a lot of time and stress hunting down my easily misplaced stuff. If you're an Apple user prone to losing your keys/wallet/etc., they're definitely worth considering. Just don't expect pinpoint accuracy or ultra-sticky adhesive right out the box!