Description: 1.100% Brand new and high quality.2.It is durable and convenient.3.Simple user instruction and easy to use.4.It can replace you pickup truck、 Van、 Boat air horn. Specification: Color:RedSize(approx.):91.6mm\/3.6”(L) x 109.9mm\/4.32”(W) x 150mm\/5.9”(H)(Detail size as shown in the picture)Material:Plastic and metalVoltage:DC 12VRelay Voltage:DC 12V(30A)Fundamental frequency:530Hz±5%Sound pressure level at 2m:\u2267115dB(A)Sound pressure level at 4In:\u2267139dB(A)Reliability:100、000 on\/off cycleType of sound:harmonized twin tone Package Included:1x Hore1x RelaySome install fittingsNote:Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm)