Note: This Horns Gives Echo effect From High to Low, on Lite horn button press. Compatible for Bikes/Cars/Vans/Pickup Trucks with 12 v input 22 Magical sound effects. Includes Installation Accessories,. electric wires for installation is not included. The car/bike horn operate with 12 volt to be able to produce that loud dukes of hazard Disky sound Made for use in All weather conditions. While fitting make sure the shell open mouth is looking downwards of the earth to avoid water insertion 22 magical sounds on each press of horn button