What you've got there is the aftermarket Stebel air horn. If its hooked up, you'll blow your ear drums if you're not wearing ear protection when you push the horn button. It's a great accessory!
As mentioned above, it is a Steble horn. In order for it to work though it needs more than just wires to the battery. Normally they are wired using a relay actuated by the horn switch.
And no the 12v outlet in the other pictures is aftermarket.
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