In article ,
"cj" writes:
Hi
Wireless alarms are really coming into their own now as prices fall and
reliability increases.
Without opening on this group a long standing thread about jamming mostly
this is unheard of.
Whilst not impossible the outcome is the same for all newer alarms They go
off. So numpty jammer sets the alarm off even before breaking in.

The main problem was size of devices ,especially door contacts ,and battery
life.
Both have now been overcome to a great extent with lithium batteries lasting
up to 3yrs.

The DIY kits (around £125) are of the older type using std batteries which
can go flat quickly if in a high usage device like the front door,and not
having fitted any can't comment further.

As for the newer systems my employer fits around 6 systems a month .

Wired systems are by no means obsolete and are the best option for
reliability maintenance longevity and cost, but radio is ideal for quick, no
mess installation with full BS and ISO accreditation.

Don't know if it's still the case, but it used to be pretty impossible
to get additional or replacement compatible wireless components for
systems a year or two later, and you were in any case limited to the
sensors that the manufacturer had decided to provide.
That's not a problem for wired systems where you can easily mix and
match components, and add some new type of sensor a few years later
which wasn't invented when the panel was installed.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]