Hmmm Is that whay so many people lose their URN police response . . family come home through the front door - entry timer ticks down and little Freddy rushes into the lounge to switch on the telly and bingo - that's one of your three strikes gone
The radio signal from the newly aquired baby monitor at number 36 is received by the siren at number 38, the siren sees this as blocking / jamming and goes into alarm mode, ( there is no other way it can warn the owner that it is compromised ).
Too many of these apparently false alarms and people will ignore the siren and not call the police and eventually will require the alarm to be turned off ( noise pollution ). Of course the "jam prevention " feature can be turned off leaving the system unable in any way to warn the owner when is blocked and cannot respond to a sensor reporting intruders.
Is the convenience of wireless installation worth it when this situation of an alarm being compromised is not only possible but does happen. A report compiled for OfCom in August 2011 mentions that as many as 30 % of wireless alarms using licence exempted radio channels could be prone to significant blocking from other equipment.
By all means recommend and install them but do not ignore the problem that are likely to occur with equipment that uses licence exempt radio channels.