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A comment on Ultrasonic Payments. Parent comment

Re:Ultrasonic Payments by shepherdjerred on Wednesday June 08, 2022 @02:54AM (#31664191)
How loud? These are audible to me without an implant (unless some are audible and some are inaudible)
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Re:Ultrasonic Payments by jhugo on Wednesday June 08, 2022 @03:50AM (#31664495)
You might be hearing a relay, which is itself switched by the proximity sensor.
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