Description:Quantity:1 pairDiameter:12cm / 4.72Sound Output:139DB - 530-680 HZPower Source :12VMade of Steel and Powder coated in Red Color for a Long Lasting FinishIncludes 2 Universal Mounting BracketsNo External Air Supply NeededFitment:1993-2011 Subaru ImprezaPackage includes:1 pair 139Db Horn