F Murtz wrote:

Local hero wrote:

Hiya

My Brother-in-law has just bought a house where the previous owner
had died, so no-one to ask questions of. Inside there is a small
(about 3x2 inches) yellow plastic box mounted on the wall, with a
small black plastic key (about 1.5 inches long) in it. To the left
of the key hole, still part of the box, is what looks like it might
be an indicator of some sort, but whatever position the key is
turned to, the indicator stays the same.

It is positioned by the front door, and there is another one in the
main bedroom.There are cables running to the boxes, but can't trace
them without a lot of removing of fixtures/boards etc.

There is a burglar alarm fitted, but he doesn't have the code and so
can't tell if it worked, or if it is related to this little key box.

Any ideas what they are.

Many thanks

Press it and see what happens.

Did try that Mr Muntz - with fingers in ears! But since the system
isn't armed, nothing happened.

But we think we just found the alarm code. So here goes!!