About 20 or 30 years ago, a friend of mine had a key fob which responded
when you whistled the correct note (correct pitch). Great for finding the
mislaid keys, or whatever you attached it to!

Hal Cain

On Fri, Oct 16, 2020 at 10:57 AM espee8800 espee8800@...> wrote:

> I think I need one attached to my phone, it's so smart it often outsmarts

> me to its location within the house.

>

> On Thu, 15 Oct 2020 at 16:26,mick...@... mickalex@...>

> wrote:

>

>>

>> I have heard, but can't confirm, that they are used for something far

>> more mundane than vehicle tracking or announcement triggering - to allow

>> the contractors who clean the stops and replace timetables etc to log where

>> they have been.

>>

>>

>>

> --

>

> cheers and best wishes,

> David in Avenel.au,

> [Before you change anything, learn why it is the way it is.]

>

>

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