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The beep can be silenced with a bit of surgery before you fit them.
They should be considered a cheap add on to supplement a good quality tracker rather than a primary device so the separation alert is not really needed.
The way Apple implemented separation is for you walking away from the tag rather than the tag walking away from you. In the way it’s been done you get notified in about five minutes of loosing contact with the tag unless it is in a trusted location.
Very interesting. I've been reading about AirTags vs Samsung SmartTags vs Tiles. AirTags win this review https://www.theverge.com/22570161/apple-airtag-samsung-smarttag-tile-pro-bluetooth-tracker-review-test-comparison but this article says they don't give a separation alert until 24 hours after the bike's been stolen, and you can't stop them beeping, which would alert the thieves https://www.seattletimes.com/business/technology/i-found-my-stolen-honda-civic-using-a-bluetooth-tracker-its-the-latest-controversial-weapon-against-theft/