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From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Lowest power, short (10s of meters) range, low data rate, wireless technology
Date: Fri, 14 Jun 2024 14:32:43 GMT
Message-ID: <v4hkab$1lagl$1@solani.org>
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On a sunny day (Fri, 14 Jun 2024 13:11:37 +0100) it happened
liz@poppyrecords.invalid.invalid (Liz Tuddenham) wrote in
<1qv58kx.xko9yj1wlrgyuN%liz@poppyrecords.invalid.invalid>:

>Jan Panteltje <alien@comet.invalid> wrote:
>
>[...]
>> I have some bluetooth audio link modules
>> can be used for data too, tx and rx both battery based, very small.
>> Runs about a up to few hours on a battery charge
>> ebay
>
>Not showing up on eBay yet.  Loads from Germany and Latvia but none from
>NL.

 https://www.ebay.com/itm/385988155881

Bought years ago, recently needed it for my new TV, to my surprize it worked right away.
It is a one way audio link,
so if you want to send data via the thing, you need to for example use modem chips like TCM3105 (up to 1200 Bd).
I have used that chip to send data via the 27 MHz (think it is still a license free band here) in the Z80 days.

>What sort of range do they have?

10 meters maybe.

This is ebay with everything on a PCB:
 https://www.ebay.com/itm/155931101533
  have not tried that one.