Who cares? MANY of us have had the old "my battery keeps dying so I disconnected the siren and now things are OK" - this has become so common, that at local tech days, one of the things we do is disconnect the siren for those who are timid about tearing into the car, as a service to fellow owners. This way, that particular owner never has to deal with the siren doing what they all do as they age: Drain the battery.

ANY used siren you buy, if the batteries are not already leaking, soon will have leaking batteries. If you can find one that is in good shape, you MUST replace the batteries before putting it in the car - again, 20 year old batteries are a ticking time bomb.

Way easier to just disconnect the damn thing.