I remove the negative, the alarm start to sound. I remove the the positive wire and the alarm still sound. Where does the battery power from to sound the alarm. There is another way to remove the battery without sound the alarm, without remove the main fuse.

 

For disabling the alarm will need to first remove the cover from the main fuse.
Then turn the switch on.
Turn it back off and before the alarm is activated( 4 indicators flash), remove the main fuse. Alarm is now deactivated.

 

The Smart Siren has a rechargeable 9v battery

 

Put it in transport mode before you remove the battery wires.