Can I add additional sirens to the DSC Impassa?

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The Impassa benefits from being able to use DSC’s wireless sirens: WT4901 indoor siren and WT4911B outdoor siren with blue strobe and temperature sensor. You can add up to 4 of any combination of these sirens as well as the onboard siren in the main panel. The enrollment process for the sirens is just like any other wireless device. The batteries with the WT4911B do need to go through the depassivation process that is outlined in the manual before it will work properly.