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Next comes the siren, it has a strong base plate that will be held by three screws (supplied in kit). Where you mount the siren is up to you but remember that it shouldn't be easily accessible from outside the car incase thieves see it and cut the wires before breaking in. I put mine under the bonnet against the firewall which is pretty much the accepted place but I've heard of people putting them inside the car (what sort of thief would drive off with that screaming in their ears is the logic) or in the boot or under the rear seat etc the placement is up to you.