"dennis@home" :


"John Rumm" wrote in message
...

Once weakness is that the code buttons are often visibly cleaner than
the rest!

At the risk of pointing out the obvious.. alarm panels with membrane
pads usually have indented surfaces where the active buttons are.
Unless you change the code occasionally.

True, but with electrical system the digit order is important and
repeated digits are possible. So the wear pattern isn't the complete
give-away that it is with the mechanical system we've been talking
about.

--
Mike Barnes