FARBIN 24V Train Horn Loud Air Horn with Compressor Truck Horn Kit with Wiring Harness

Loudness: 150db±5db  Package Includes:                   1 X Air Horn                   1 X Relay                  1 X Harness package                   1 X Filter                   1 X Screw nut cushion block                  1 X Button with 3M line Several common wiring errors: 1. After connecting the line press the horn button if the horn will not sound and the relay will not clatter which means that the blue line and the white l