When it comes to buying AHD it is important to understand that with much competition arising due to economic pressures around the world there is going to be much more trickery when it comes to extreme cheap pricing systems especially over the internet. What you the consumer has to ask is the to good to be true CCTV system prices entering the Australian market has it been properly tested in an official laboratory in the country of manufacturing has it been built in a sweat shop somewhere in Asia or will it catch fire due to the extreme illegal short cuts that the low end manufacturers take. My advise is be wise to the deception & trickery of extreme cheap systems as we all remember the 30 dollar Vacuum Cleaner which lasts only a few months at most but if you want to learn the hard way then you will have to learn the hard way.