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WiFi signals can measure heart rate—no wearables needed
(news.ucsc.edu)
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this post was submitted on 04 Sep 2025
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WiFi can also do pretty precise location. Bluetooth/BLE even more precise (inches or less)
I think they mean without a phone. A 2.4ghz radio can be used as a presence detection radar.
It sounds like they're specifically talking about a phone, making reference to app permissions and TikTok.