Siren incorporating an inbuilt rechargeable battery pack.
This is the ultimate frustration, a siren that won't stop even if the wires are cut or the car battery is disconnected. The owner can turn the siren off when the battery is disconnected by using one of the two security keys supplied.
This siren is able to work with any Vehicle Security Alarm System and has positive or negative input triggering options.
If you are attempting to fit this yourself please mount the unit away from any areas where water could damage the siren.