Some kind of siren - think it is piezo type. It has red and black wire, where black wire allready had ground pin on it.
Just to satisfy your curiosity...
...the same way I connected it the first way. To bring two wires from siren to the alarm unit. Don't bother the car since I allready fry up the central convinience controller and also airbag conntroller reports a DTC of internal memmory error - not even flashing erases the DTC. But like I told it it a hobby of mine I want to make some application that will also work.
BTW the irony is that car allready had a stock alarm (now it is gone since it was part of the central convinience unit that is fried) and don't know if mine will ever work.