"Jupiter" wrote in message
...
On Thu, 23 Mar 2006 18:09:36 GMT, "someone here"
wrote:
snip sonic alarm stuff
One works for me and no-one of any age has said that they can hear it.
Mine's combined with a detector so it doesn't sound continuously. I
watched a cat venture on to one of my seed beds, look up very startled
and rapidly depart.

Motion detector sounds like a good idea.
Mine is/was a constant.

I can't hear it, but I have lost a lot of the top end of my hearing
over the last five years.

Dave