SUPER LOUD MARCO TORNADO Compact Air Horn for ALL 12V Vehicles: Motorcycles, Cars, & Trucks LOUDER than all the wannabes and knockoffs at 150/151 dB TWO HARMONIZED TONES: Get the attention of other drivers not paying it ! ZERO DEFECTS: 100% Tested before leaving the factory. NEW DIRECTIONS: Detailed installation guide available for download (beta). NEW TWO YEAR LIMITED WARRANTY with Shipping Reimbursement Program (See description for more info and details).