On Fri, 24 Apr 2009 22:23:58 +0100, andrew wrote:

There's nothing particularly valuable to protect but once notified
someone can be on the scene in seconds.

Assuming that it's not 0330 and the respondee(s) are not tucked up in bed
sound alseep... And what are they going to do even if they do get there
and find intruders? People caught where they shouldn't be tend to react in
a none to friendly manner. Citizens Arrest? Very, very grey area of law
and best avoided.

Think a bit more about what the plan of action is to be when the alarm
triggers. Have a look at sound bombs.

--
Cheers
Dave.