1Made of 100% non?magnetic stainless steel material with a bright polished surface effect that will not rust. 2Super?loud 125dB sound, which is marine grade, specially designed for exterior use. 3It is a good choice for marine applications in a salt water environment but can also be used on other 12V vehicles. 4With simple installation, only need four wires, and does not require an on-board air system. 5Own the advantages of durable, sturdy, reliable and corrosion resisitant and rustproof.1 x Dual Trumpet 2 x Black Rubber Pad 1 x Accessory Bag Condition: New_x000D_Item Type: Dual Trumpet_x000D_Color: Silver_x000D_Material: Stainless Steel_x000D_Large Trumpet Length: Approx. 460mm/18.1in_x000D_Small Trumpet Length: Approx. 395mm/15.6in_x000D_Diameter: Approx. 105mm/4.1in_x000D_Volt: DC 12V_x000D_Current: 10.0A_x000D_Sound Level: 125db_x000D_Frequency: 380Hz_x000D_Class: Marine class_x000D_Trumpet Type: Electric Trumpet (Work directly when connected to electricity) 1Made of 100% non?magnetic stainless steel material with a bright polished surface effect that will not rust. 2Super?loud 125dB sound, which is marine grade, specially designed for exterior use. 3It is a good choice for marine applications in a salt water environment but can also be used on other 12V vehicles. 4With simple installation, only need four wires, and does not require an on-board air system. 5Own the advantages of durable, sturdy, reliable and corrosion resisitant and rustproof.1 x Dual Trumpet 2 x Black Rubber Pad 1 x Accessory Bag