"dicksplash" wrote in message
...
Has anyone got one of these that works and if so which one as they range
from about £20 up to £60!

A neighbour had one but has now abandoned it, although I don't know why.
Even though it used ultrasound I could still hear it - and I am a little
deaf. It
sounded like something squeaking as if blown gently in the wind.
--
Nick Wagg