Any questions

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@Auto-Links

You have 2 options… you can get a backup battery where if your main battery is disconnected your alarm will still get power… but the cheaper option is to get a backup battery siren, how that works if your battery is disconnected the backup siren has its own power and will kick in when it loses 12V or ground. It will keep wailing until its turned off by key, or if the thief finds it and smashes the crap outta it.

Yes you can get a back up battery specifically for the alarm. DEI makes them and they are not that expensive.