Plants and bio-feedback....help pse.

[Bazzer]

Hi there.

Thank you for reading this posting.

Does anyone remember those bio-feedback devices of some years back
where you connected a plant to a small box and the plant would send
'clicks' or 'squeeks' according to it's reactions to things in the
environment?  Does anyone know if or where such a device could be
obtained??

Many thanks in advance for any help.

Paul (UK).