it's probably the Logic 850/950. They were the ones that they fitted the most of i think.
The alarm kept going off on mine but i just turned the sounder off - there should be a key on one of your keyrings that fits the sounder under the bonnet.
But, if you're looking for conformation on the model of the alarm, remove the glovebox - 4 screws i think, and the brainbox should be sitting on top of your fan box somewhere.