Reply to post:

Google DOG WHISTLING fails to send URLs across the room

Andrew Jones 2

Actually if you read the press release again - you will find that they EXPERIMENTED with high frequency tones and found them to not be very reliable because laptop microphones weren't designed for that frequency range and some speakers had trouble generating the sound. So they ended up using tones in the human range of hearing - since computer speakers and microphones are designed for that frequency range. Hence when you install the extension and press the tone button - you can hear the noise it makes and animals aren't bothered by it at all.

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