Application: Suitable for cars, trucks, trucks, boats, vans, buses and the 12 volt vehicles Specification: Air compressor input voltage: 12V Red color Material: ABS plastic Decibel / sound pressure level: 125 db Working air pressure: 0.08 ~ 0.12mpa Trumpet length: 10.63 \": approx 27.0 cm 10.24 \": approx. 26.0 cm 7.68 \": approx 19.5 cm 7.28 \": approx 18.5 cm 6.1 \": approx. 15.5 cm Trumpet diameter: 3.27 \": 8.3 cm 3.15 \": 8.0 cm 2.95 \": 7.5 cm 2.95 \": 7.5 cm 2.76 \": 7.0 cm Package Include: - 5 x air horn - 1 x compressor - 1 x hose - 1x 12V relay Note: Please feel free to contact us if there is anything we could help.