Hella Marine TC16 Dual-Tone Boat Horn Kit, 12V 113dB

Every boat needs a horn you can count on, and the Hella Marine TC16 kit gives you two of them. This set pairs a 500 Hertz high-tone trumpet with a 400 Hertz low-tone trumpet, and when they sound together you get a rich, layered blast that reads as urgent from a long way off. One horn on its own can sound thin. Two tones stacked on top of each other carry farther and cut through wind, engine noise, and the general racket of a busy harbor.

The numbers back it up. Together the pair puts out 113 decibels, which is plenty to get the attention of another skipper who isn't watching where they're going. That's the whole point of a good horn. You want to be heard the first time, whether you're signaling your intentions in a tight channel, warning off a boat drifting toward your bow, or just letting the marina know you're coming in.

Hella Marine built these to live outside. The trumpets ride in black ABS plastic housings that won't rust and won't fade the way a cheap chrome horn does after a season in the sun. The mounting hardware is galvanized metal, so the bracket itself holds up to salt air and spray instead of turning to a rusty mess behind your console. Hella Marine calls their gear fit and forget, and a horn is exactly the kind of part where that matters. You mount it once, wire it in, and you don't want to think about it again until you need it.

Wiring is straightforward for anyone comfortable with 12-volt DC work. The kit runs on a standard 12 Volt system and pulls about 72 Watts, which works out to roughly 6 amps of draw. Because of that current, we always tell people to wire a horn like this through a relay rather than running the full load through the dash button. The button triggers the relay, the relay feeds the horns, and your switch stays cool and lasts for years. A relay and the wiring aren't part of this kit, so grab those separately if you don't already have them on hand.

Mounting is flexible. The trumpets are 3.4 inches across at the mouth, compact enough to tuck into an engine compartment, under a gunwale, or behind a console where they're out of the weather but still free to project sound. Best practice on the water is to point the trumpet openings slightly downward so they drain and don't collect rain or spray. The galvanized bracket gives you a solid, adjustable base to set that angle. Keep both horns clear of anything that would muffle them and you'll get the full 113 decibels they're rated for.

This is a genuine dual-tone setup, not a single horn dressed up. You're getting two separate trumpets, the high-tone 500 Hertz unit and the low-tone 400 Hertz unit, plus the galvanized bracket to hang them. It's a common upgrade for boaters who are tired of a weak factory beeper, and it's just as at home on a center console, a cruiser, or a pontoon. Anywhere you've got 12 volts and a spot to mount them, these will give you a horn that actually sounds like it means it.

A loud, reliable horn isn't just a nice-to-have either. Sound signals are part of the navigation rules, and there are times you're expected to make one, like backing out of a slip with limited visibility or signaling a turn in a narrow channel. A horn that other boaters can actually hear over their own engines makes those moments safer for everyone. The TC16 pair gives you that headroom, and the two-tone blend is easy to pick out from the higher-pitched single horns a lot of smaller boats run.

One honest note on what this is and isn't. It's a 12-volt electric trumpet horn kit, so it needs power from your battery or bus to work. It's not an air horn and doesn't need a compressor or tank. That keeps the install simple and the maintenance close to zero, which is exactly what you want from safety gear. Wire it right, mount it so it drains, and it'll be ready every time you reach for the button.