It has two separate boxes: alarm that interfaces directly with the controller and a GPS+GSM module that interacts with the alarm box. There is also a horn wired to the alarm box.
I see your logic and, as a security professional by trade, I can tell you that it is close to impossible for any security measure to stop a determined thief/criminal. The key word is "determined" which means that a criminal has unlimited resources in terms of knowledge, available technology, and time to defeat your security systems. If we are talking about government-sponsored criminals that mount attacks against other countries, they are likely to have those resources available. However, if we are talking about a random bike thief by Walmart, chances are he or she will not have those resources. As you have noted, there is a deterrent factor that will probably scare off most of the technically illiterate thieves. However, the GPS/GSM module will also immediately send a text to your phone the moment someone touches your bike. That shortens the time for a thief to try to disable the alarm and steal your bike. The GPS/GSM module also has a built int backup battery that will run for 24 hours even if the main power is cut. A thief has to have prior knowledge of that to avoid being located an arrested by police that you would want to call on such occasion.
maanebedotten wrote:Do you have any pics of the alarm/gps module? Is it a single box connected to controller?
The alarm would of course be a deterrent, most thieves would probably give up and walk away if it starts screaming. But if not many people around, would the thief not try to find the box that is making noise and just remove it? Thereby also removing the tracking even though he did not even know it was a tracker?