Installation Solution 4-way Train HornInstallation Solution 4 Way Train Horn Gives and 12 24V DC off road vehicle or truck the powerful sound of a train air horn The horns are operated by a heavy duty 12 24V DC electric solenoid valve The trumpets are finished with an attractive and durable high quality zinc material Mounting hardware included Capable of pressures between 50 125psi Overall Dimensions: 6 x 6 x 14 Trumpet Sizes: 14. 2 x 3. 7 11. 8 x 3. 7 9. 1 x 3. 7 7. 9 x 3. 7