In article ,
Mark writes:
On 29 Jan 2005 00:47:40 GMT, (Andrew
Gabriel) wrote:

Thanks for that. You mentioned "anti-masking" features, what exactly
is anti-masking?

The ability for the detector to realise it's been masked
(covered over) to defeat operation. This however defeats
the extra false alarm protection afforded by dual-tech
units due to the way it works. Anti-masking is really
only an issue if you expect potential burglars to have
access at times when the system isn't armed, e.g. in
public buildings, workplaces, etc.

--
Andrew Gabriel