What kind of car alarm do I have and how do I turn it off?

I need to figure out what kind of car alarm I have so I can disable it. Every time I turn on the car it starts honking at me. Locking and unlocking the car doesn’t seem to turn it off.

I think this is maybe my car alarm under the steering wheel? (see the little black thing with the red light dot on it?):
https://www.dropbox.com/s/bo8txgch6jwe4mj/caralarm.jpg

It’s a Toyota Camry 1997 but don’t know if that helps because I called the dealership and described it and they said it’s probably not a factory installed one.