Basically, if a thief breaks into your car and cuts off your car alarm
wires, and then cuts off the back up siren
with
built in battery cables, the siren
will continue to make noise. The only way to deactivate this siren
is to physically enter a key that it comes with inside of the back up siren
with
built-in battery and it will then turn off.
This is another great way to prevent thieves from breaking in since the car alarm
siren will continue to make noise and they will not know what to
do and leave since they will cut off all the wires and the car alarm
will still be going off.