Product descriptions:car speaker,car horn,auto snail horn Details FL 138 Voltage: (V) 12-24 Current: (A) ≤4 Frequency: (Hz) H=510±20 L=410±20 Sound level: (A) 105-118 db Diameter: (mm) ø90 Applicable for cars Universal type Certified ISO9001:2000, CE, CCCNational Security Certificate 14 months warranty, delivery on time, keep you known during producing period. For more details, please feel free to contact me!