The structure of the snail trumpet is using the resonance shaking、in order to make the sound more strong、more save electric.The sound of the snail trumpet is ‘BA、BA~~~~~’Full sound、and durable.FeatureThese type of trumpet is consisted of high and low pitch trumpet、high pitch is 510HZ、low pitch is 410HZ、the sound of the trumpet is big、up to 105/115 db、please be noticed that the sound is very big、you should not make the noise to the passes-by.This type of trumpet is in common use、suitable for all kinds of 12V cars、sedan、SUV、and other parts of the motor、NoticeThis type of trumpet is double inserting disk、no need for installing the wire harness.but if your car only have one trumpet、you should install the wire harness.SpecificationThe outside of the white part is the output wire、red part is the input、black part for cling the iron、blue parts for cling to the positivepole、the middle for open circuit.Two trumpet make the sound more comfortable、suitable for different people.High pitch:510HZ.Low pitch:410HZ.Voltage:12VSize:9cmPackage includeOne pair of trumpets.For your convenient in using、we offer two sheet iron、two screw hat for you.