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What kinda relay do I use to close a circuit when a siren goes off? Answered

I bought some of these http://www.amazon.com/gp/product/B000IF6URO/ref=ox_ya_oh_product and would like to wire up a usb gamepad to detect the siren as a button press. I'd assume this should be very simple the relay will connect to the siren speaker. I can then write an app to email/text message me if the sensor detects water on my kitchen floors.

I'd like to know what kind of relay to use (how much power, an exact one would be nice), I just need a momentary circuit close (similar to pressing a key).
I'm a programmer with a limited knowledge on circuits.

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