(名詞/可數) 沉默手環 － 戴在手腕上以防附近智慧型裝置聽到或竊聽配戴者談話的裝置。複數為 bracelets of silence。
How worried are you about technology listening to your conversations? Have you ever had an experience that made you think your phone, computer or smart home device was eavesdropping on you? This “bracelet of silence,” developed by two computer science professors and an assistant professor, emits ultrasonic signals when activated, preventing nearby microphones from listening to the wearer’s conversations.
[nytimes.com, 5 March 2020]