DUAL Super Tone LOUD Blast 139Db Universal Euro RED ROUND HORNS (Quantity 2) High Tone / Low Tone Twin Horn Kit with Bracket Pair Compact &ndash; Extremely LOUD for Car Bike Motorcycle Truck for Mazda Protege Eunos Miata MX5 MX6 RX7 RX8 MAZDA 3 6 R3 323 626 CX7 CX9 M2 M3 M5 MPV RX3 R1 R2 12A 13A 13B JDM other models Universal Fitment / Relay and 2 Mounting Brackets plus Instructional Installation Diagram Included Super Loud - Sound Output: 139DB - 530-680 HZ / 12V Power Source - No External Air Supply Needed Made of Steel and Powder coated in Red Color for a Long Lasting Finish Mounting Type: Single Screw - Terminal Contacts: Blade Type - Includes 2 Universal Mounting Brackets Diameter = 4.89 / 124mm (without mounting bracket), 5.31 / 135mm (with mounting brackets). Depth (Thickness) = 2.65 / 67mm. They can easily be tucked behind Most Vehicles Grills.