The HELLA horns features increased corrosion protection, Teflon pill to protect against humidity and optimized sound funnel. Hella's Twin-Trumpet horn kit is a great upgrade for any vehicle. The twin trumpets are self contained, there is no compressor to mount so this is a great choice where there are space constraints. Sound level is 110Db, Frequency 500Hz high tone, 400Hz low tone, Draws 6 amps each trumpet. Kit includes one high and one low tone trumpet unit, relay, mounting hardware and instructions. Product Features:Red Plastic Trumpet Horns with BracketFull harmonious and wide sound radiationStrong soundOE replacement for various applicationsStylish design Specifications :Voltage: 12VLow Tone Frequency: 400 HzHigh Tone Frequency: 500 HzSound Level at 6.5ft (2 Meters): 110 dBPower Consumption: 72WApproval: ECEBracket: M8 mounting screw Kit Includes:(1) High-Tone Trumpet Horn(1) Low-Tone Trumpet Horn(1) Relay