Valcom's 15-Watt, Marine Horn is constructed in Non-Yellowing compound that is Perfect for shipboard and marinas and feature Easy Omni-Lock I-Beam Clamp Mounting System, Weather- Interior or Exterior, Resist Deteriorating Of Salt, Sun, High Humidity, Equipped With O-Ring Seals, Stainless Steel Hardware; Shipping Weight: 4.8 lbs (2.18 kg)Dimensions: 7.38" H x 10.0" W x 10.4" D(18.75 cm x 25.4 cm x 26.4 cm)