The large Powerhorn model PH508 is 120 db,
and the mini Powerhorn siren, SH10A is 90db
methinks.. Just go to the product info on
X10.COM and the specs are there,, if not
directly, inside the installation
instructions.
It doesnt actually sound like a siren, more
like a loud shrill, shrieking noise, sort of
like my ex-wife. lol