Since we are not yet officially integrated with Vera, the Dome Siren is recognized in Vera as a generic Siren (see figure 1.) To pair, click "Add a Device" in the Devices section, search for “Generic Z-Wave Devices” (near the bottom of the list,) and rename it after it is paired to help tell it apart from other devices. The Siren will appear to be “on" when sounding, and will be “off" when quiet. You can use the Siren in your scene actions to receive notifications when events are detected - configure the scene to “Turn On” the Siren to trigger it (figure 2.)
You can also use the Siren's secondary chimes and change other settings - click here to see how to use the Siren's chimes with Vera.
Note that this was tested with Vera UI7.
Fig 1 - how the siren appears in Vera when off.
Fig 2 - How it will look when you use the Siren in a scene - in this example, the Siren will turn on when the scene is triggered.