I am considering fitting a wireless burglar alarm. Police web sites advise that a wirefree system should conform to BS6799 Class VI. but all the DIY kits on sale appear to either not quote a BS specification or are BS6799 Class III.
I am unable to find an explanation of the difference between these, and the person at my local police station I was referred to for advice on security matters didn't know anything about the subject either. As far as I can make out from reading advertisements for different systems Class III uses a frequency of 433 Mhz and Class VI uses 868 Mhz.
Does anybody know a) if this is the only difference between the 2 specs and b) what is the advantage (if any) of the higher frequency?




