Highly durable and salt water resistant. The entire trumpet horn is made from 304 stainless steel.• Output: 110±5dB / 1m• Dual horn with high and low tone.• Best used on boats and trucks.• 12VDC 6.0A 115±5dB.• 24VDC 3.0A 115±5dB.• Long Trumpet Size: 465mm.• Short Trumpet Size: 410mm.