White Horn For 12 volt DC systems. A low profile compact horn, which is completely sealed. Includes a solid cover, diaphragm, mounting bracket, and a vibration dampening pad. Pre wired. 4" L x 3" W x 1-3/4" H. What is the Attwood difference? Value and ingenuity. For more than 100 years Attwood has been proud to serve the parts and accessory needs of the marine industry. We have partnered with you to design, manufacture, test, and distribute a complete line of products that have been a part of your tradition, and we thank you for this opportunity.