I guess lmao, but much more rudimentary, less reliable and with loads of issues, as it had to blast piercing sounds through a speaker and then capture those with a microphone. But it was pretty cool when it worked!

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skinfaxi 2 hours ago | parent [-]

Did you explore using frequencies outside the range of human hearing?

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hootz 2 hours ago | parent | next [-]

No, but that's a cool idea. I think the main problem is that consumer hardware usually gets kinda inconsistent outside our hearing range.

	▲	deletedie an hour ago \| parent [-]
		Apple uses this approach when pairing some devices for verification e.g. setting up HomePods using an iPhone

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reaperducer 26 minutes ago | parent | prev [-]

Did you explore using frequencies outside the range of human hearing?

Amazon had modems very much like this in its little buttons that you could stick to your refrigerator and automatically order different items. When setting up the device, you could only hear the little clicks as it turned on and off.

I loved the technology. Hated that the prices changed all the time and you never knew what price you were going to pay ahead of time.