Dual Trumpet Air Horn With Compressor Main material: Chrome plated zinc alloy, Colour: Silver (Chrome Plated) Overall Dimensions: 7.9"L x 5.5"W x 2.7"H (20cm x 13.97cm x 6.86cm), Trumpet Lengths: appr. 7.9" (20 DB output: 150 db (+/-5db), Input Voltage: 12V