horn

hey i bought a new horn for my car an i have 2 factory horns on my car the one i bought has a positive an negative wire red an black it sounds like a police siren lol ... how do i connect it to my car so that when i push the horn it work .. i cant figure it out an if some one would help me it...

So today, I went to lock my car...and all I heard was the door lock. No, nice reassuring sound of my horn. Could anyone tell me the reason for this?