MPC H003 (0934) Chrome 3 Trumpet Air Horn Includes upgraded valve & mounting hardware. 12 VDC Trumpet Lengths: 13.75", 11.5", 9". Overall Dimensions: 13.75"L x 7"W x 6.5"H Trumpets Bell Width: 3.75" DB output: 150.2 db Construction: Chrome plated zinc alloy. PLEASE NOTE: This horn requires a compressor and air tank to operate. The compressor and tank are not included in this listing