Product descriptions:auto horn,auto speaker,car speaker Details FL 138T H/L 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, CCCNational Security Certificate Remarks: Dustproof and waterproof type. Best quality and novel design have gained most of customers all over the world. 14 months warranty, good after service, delivery on time! For more details, please feel free to contact me!