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謝謝（不,我沒有精神分裂症）
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this post was submitted on 14 Apr 2026
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I was gifted a thermal insulated coffee mug with built-in battery to keep hot. Connects to phone via Bluetooth. Got warnings that the mug would be able to track all 50+ Bluetooth MAC IDs that are in range (I’m in an apt building). That mug will never get turned on or used
Imagine being afraid of a Bluetooth device behaving like every other Bluetooth device ever created.
Except that it sounds like this hooked into an app and sent all the info about those Bluetooth devices to the manufacturer, which some data collectors can use process of elimination to isolate you. Normal (privacy-respecting) Bluetooth devices do not pass this info to the service provider and only your phone uses it to pair with the device.
Sounds more like the app presented a standard request for location access, which is required for scanning nearby devices to be able to find and pair the mug with an app.
E: For the paranoid:
https://developer.android.com/develop/connectivity/bluetooth/bt-permissions
You are correct that this is normal for the OS. The OS will use this data to determine your location. What is not normal is abusing the Bluetooth permission to send a list of scanned devices to app vendor. They should only be collecting the location, not the raw Bluetooth list. I don’t know what the app is to confirm, but the way they said it, they would be handing all of the local device data along with the standard location permission. This is the extra data that can be used to isolate you more than just a location could.
This is similar to browser fingerprinting, but worse because your phone goes with you everywhere.
One final mention is that the app is likely not collecting that list once, but rather regularly, so they could build a profile on what devices you’re in range of and by extension where you are regularly, even if you chose to disable your location, since they’re using Bluetooth MAC addresses as their workaround.
No one, not even OP, said anything about the info being sent to the vendor. You're arguing about a point that you pulled completely out of the aether and which has no bearing on anything in this thread.
As @Grostleton@lemmy.dbzer0.com said, that's how every Bluetooth device works, but I'm also curious what purpose connecting a mug to a phone via Bluetooth serves.
It's to monitor battery life and adjust temperature, you can usually do both via physical interaction with the warmer, but they offer an app that may display more info or allow more precise control over the temp. Usually the app is completely optional.
No idea, maybe that's where you see the battery level? I like to imagine the coffee mugs are just chatting amongst themselves.
"Ugh Peggy with her fucking black coffee again, we make it through 15 minutes of work and we'll be back in here so we can refill .... Same shit every morning".
"You're telling me, Clyde's been milking his coffee break for 45 minutes now, I doubt he even remembers telling Terry we were going to send him that paperwork"
Are you sure they weren't MUG IDs?