This Attwood Bellow Signal Horn uses lung power to produce a signal that can assist in personal protection and safety on land and on the water. This horn uses your breath, not CO2, Freon, or batteries. It meets USCG Rule 33 (Annex III), and EPA regulations. This durable red plastic horn is 8 inches H x 3 ½ inches W. It has a molded-in loop to which a lanyard can be attached. Attwood Corporation has been an award-winning leader in engineering, testing, and manufacturing the highest quality marine products for over 100 years. We deliver safe and reliable lighting, fuel systems, water systems, seating & pedestals, swim ladders, custom upholstery, and general marine accessories that are easy to install and meet regulatory compliance.