On Thu, 09 Feb 2012 11:23:22 +0100, David in Normandy
wrote:


I might have a spare shed alarm somewhere

I probable depends on a number of factors as to how effective an audible
alarm is:
How loud it is.
How long the sound continues.
How close to residential properties.
What time of day or night it goes off.
And if they give a damn anyway.

Typically if a shed alarm were to sound for five seconds (before it got
smashed) at 3 AM, and assuming it managed to wake someone, they may be
less likely to get out of bed to look out of their window, especially if
it wasn't their alarm and if their bedroom was like the Arctic (Brrrr!)
they would be more likely to just wonder "What was that
noizzzzzzzzzzzzz" and turn over and drift off to sleep again.

It's his brother's shed and he doesn't sleep well usually.

True though if it's only going off after they've got in it's probably
useless. Also in cold weather I don't imagine batteries last long ...
A shock alarm maybe to work out when someone is kicking the door in...
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