DIY Train Horn Kit for DeWalt® 20v Battery
Quad-Trumpet Train Horn Kit Compatible with DeWalt® 20V Batteries — Up to 140 dB
Transform a standard DeWalt® impact drill into a 140 dB cordless train horn with this all-in-one DIY build kit from Train Horn Drill. Four trumpets, an integrated air compressor, and a wireless remote system are included right out of the box — no hunting for extra parts, no complicated wiring, no guesswork. Whether you need serious attention-getting power at outdoor events, want a reliable safety signal, or just love making noise, this quad-horn kit delivers the real deal.
What Makes This Kit Stand Out
Deafening 140 dB Output
Four trumpets working together produce an unmistakably loud train horn blast — well above the volume of a standard vehicle horn. At 140 dB, people notice.
Built for DeWalt® 20V Batteries
This kit is engineered to be compatible with DeWalt® 20V batteries and works with most DeWalt® impact drill housings, as well as many other brushless drill platforms. Your existing battery becomes the power source — no separate charging system needed.
Wireless Remote Operation
The included remote receiver and remote control let you trigger the horn from a distance, hands-free. Mount it, step back, and fire at will.
Extreme Trumpets Upgrade Available
Want even more sound power? An optional Extreme Trumpets upgrade is available for those who want to push output even further.
Everything Included in the Box
- 4-trumpet air horn assembly
- Air compressor unit
- Pre-wired harness with integrated remote receiver
- Wireless remote control
- Air pipe / hose
- 2 mounting screws
Step-by-Step Build Process
- Open the drill shell and remove the existing motor, gears, and wiring harness.
- Modify the shell as needed to seat the air compressor properly.
- Route and connect the new pre-built harness to the compressor terminals.
- Attach your DeWalt® 20V battery and verify the compressor powers on correctly.
- Close and reassemble the drill shell, then drill two mounting holes.
- Secure the horn mount using the provided bolts and connect the air hose to the trumpets.
- Power up and enjoy your brand-new 140 dB train horn.
Why Build with Train Horn Drill?
This kit is designed for performance, durability, and straightforward assembly. Every component you need is in the package — the compressor, the harness, the trumpets, the remote. You're not piecing together mismatched parts from three different suppliers. Just follow the steps above and you'll have a fully functional, battery-powered train horn built around your existing DeWalt® 20V platform.
Order your DIY Train Horn Kit for DeWalt® 20V today and build a 140 dB horn that demands attention.
- Compatible with the cordless battery you already own
- Heavy-duty metal trumpets — no plastic
- Wireless remote trigger — line-of-sight up to 160 ft
- Ships same business day from a US warehouse
- Ready out of the box — clip on a battery and blast
In the box
Everything you need to make some noise
No extra trips to the hardware store. Open the box, snap on a battery, and you're loud.
Premium Horn Gun
Hand-built on a real impact-driver chassis with steel internals.
Quad Metal Trumpets
Four polished bells tuned to push a full 150 dB blast.
Wireless Remote
Compact key-fob trigger line-of-sight range up to 160 ft.
Mount Bracket
Universal under-hood / roll-bar bracket with rubber isolators.
Heavy-Duty Air Lines
Reinforced PU tubing pre-cut and crimped to length.
3Ah Battery
Add a fresh pack if you do not already run this brand.
Fast Charger
Tops a 3Ah from empty to ready in roughly 45 minutes.
Quick-Start Card
One page. Three steps. You will never read it twice.
Easy setup
Loud in under 90 seconds
Four steps. No tools, no wiring, no manual.
Open the box
Cardboard
padded foam
kit inside. No fishing through packing peanuts.
Attach the trumpets
Two threaded fittings
hand-tighten. About thirty seconds with a free hand.
Snap in your battery
Any compatible cordless battery clicks straight into the grip — no adapters.
Pull the trigger
Pair the remote in five seconds
or just squeeze. The neighborhood will know.
Where people use it
Built for real situations, not just the driveway
Truck & Off-Road
Mount in the bed or under the hood. Wake up the trail when you crest a hill.
Marine & Boat
Saltwater-rated trumpets and a battery you already use on the dock.
Farm & Ranch
Move livestock, signal across pastures, scare coyotes off the fence line.
Tailgates & Events
The crowd hears it. The neighbor hears it. The guy two streets over hears it.
Why it stands out
Seven reasons this isn't a toy
True 150 dB at the trumpet mouth
Measured at one meter — not at twenty meters with a press release.
Built on an actual drill chassis
Steel gear case, not a 3D-printed lookalike pretending to be one.
Runs on the batteries you own
Any compatible lithium pack drops in. No proprietary cells.
Reliable RF remote, not Bluetooth
Sub-GHz key-fob signal punches through trucks, trailers, fences.
Hand-assembled, then sound-tested
Every unit gets a real-air blast on the bench before it ships.
Ships same day from the US
Order before 1 PM PT and it leaves the warehouse the same afternoon.
Backed by a 1-year warranty
Covers the compressor, electronics, trumpets, and remote.
Engineering
Where the loud actually comes from
Quad-Trumpet Array
Four offset throats stack pressure waves so the peak SPL hits harder than a single horn.
Sealed Pump Head
Brushed-motor compressor with a sealed head — no air loss between blasts.
Precision Reed Tuning
Steel reeds tuned to a low diesel-locomotive note, not a dog-whistle squeak.
RF Pairing in 5 Seconds
Hold the trigger, click the fob — paired. Re-pair anytime if you add a second remote.
Thermal Cutoff
Compressor backs off automatically if you hold the trigger past the duty cycle.
Powder-Coat Finish
Three real color options: jet black, mirror chrome, or torque-wrench red.
vs. the alternatives
Why owners pick this over a tank kit or a cheap import
| Best Value Train Horn Drill DIY Train Horn Kit for DeWa... | Compressor + Tank Kit | Cheap Import Drill Horn | |
|---|---|---|---|
| Peak loudness | 150 dB | ~150 dB | ~120 dB |
| Install time | Under 1 minute | 2–6 hours | 5 minutes |
| Power source | Battery you own | 12V vehicle wiring | No-name battery |
| Continuous blast | Until battery dies | ~3–6 sec / refill | 1–2 sec then drop |
| Trumpet material | Solid metal, polished | Metal | ABS plastic |
| Remote | RF, 160 ft | Wired switch | None / IR |
| Warranty | 1-year US-based | Varies | None |
Quad-Trumpet Train Horn Kit Compatible with DeWalt® 20V Batteries — Up to 140 dB
Transform a standard DeWalt® impact drill into a 140 dB cordless train horn with this all-in-one DIY build kit from Train Horn Drill. Four trumpets, an integrated air compressor, and a wireless remote system are included right out of the box — no hunting for extra parts, no complicated wiring, no guesswork. Whether you need serious attention-getting power at outdoor events, want a reliable safety signal, or just love making noise, this quad-horn kit delivers the real deal.
What Makes This Kit Stand Out
Deafening 140 dB Output
Four trumpets working together produce an unmistakably loud train horn blast — well above the volume of a standard vehicle horn. At 140 dB, people notice.
Built for DeWalt® 20V Batteries
This kit is engineered to be compatible with DeWalt® 20V batteries and works with most DeWalt® impact drill housings, as well as many other brushless drill platforms. Your existing battery becomes the power source — no separate charging system needed.
Wireless Remote Operation
The included remote receiver and remote control let you trigger the horn from a distance, hands-free. Mount it, step back, and fire at will.
Extreme Trumpets Upgrade Available
Want even more sound power? An optional Extreme Trumpets upgrade is available for those who want to push output even further.
Everything Included in the Box
- 4-trumpet air horn assembly
- Air compressor unit
- Pre-wired harness with integrated remote receiver
- Wireless remote control
- Air pipe / hose
- 2 mounting screws
Step-by-Step Build Process
- Open the drill shell and remove the existing motor, gears, and wiring harness.
- Modify the shell as needed to seat the air compressor properly.
- Route and connect the new pre-built harness to the compressor terminals.
- Attach your DeWalt® 20V battery and verify the compressor powers on correctly.
- Close and reassemble the drill shell, then drill two mounting holes.
- Secure the horn mount using the provided bolts and connect the air hose to the trumpets.
- Power up and enjoy your brand-new 140 dB train horn.
Why Build with Train Horn Drill?
This kit is designed for performance, durability, and straightforward assembly. Every component you need is in the package — the compressor, the harness, the trumpets, the remote. You're not piecing together mismatched parts from three different suppliers. Just follow the steps above and you'll have a fully functional, battery-powered train horn built around your existing DeWalt® 20V platform.
Order your DIY Train Horn Kit for DeWalt® 20V today and build a 140 dB horn that demands attention.
Fast US shipping
- Same business day shipping on orders placed before 1 PM Pacific.
- Ships from a US warehouse via USPS, UPS, or FedEx Ground (carrier picked by destination).
- Typical US delivery: 2–5 business days.
- Tracking number emailed automatically when the label prints.
- Free standard shipping on orders over $99.
- International shipping available at checkout — duties and customs charges are the buyer's responsibility.
Need expedited delivery? Pick a faster carrier option at checkout — we ship every business day.
What ships in the box
- 1 × Hand-built train horn drill in selected color
- 1 × Pre-tuned metal trumpet array
- 1 × Wireless remote (160 ft line-of-sight range)
- 1 × Universal mount bracket with rubber isolators and stainless hardware
- 1 × Reinforced PU air-line set, pre-cut and crimped to length
- 1 × Quick-start card
- Optional add-ons if selected in your kit: a compatible battery and/or fast charger from the Customize Your Kit picker above.
Battery is not included by default — designed to slot into the cordless tool battery you already own.
30-day refund + 1-year warranty
30-day money-back guarantee. If you're not happy for any reason, return within 30 days of delivery for a full refund. We cover return shipping inside the contiguous US.
1-year manufacturer warranty on the compressor, electronics, trumpets, and remote against defects in materials or workmanship under normal recreational use.
Extended warranty (+1 year) available as an add-on at checkout. Doubles your coverage period.
What's covered
- Compressor or motor failure under normal use
- Electronics or trigger malfunction
- Cracked, dented, or rattling trumpets out of the box
- Wireless remote pairing or range issues
Not covered
- Damage from non-OEM batteries, modifications, or third-party repair attempts
- Cosmetic wear from rough handling
- Water damage to non-waterproof models
Customer shots
Real owners. Real installs. Real loud.
Photos sent in by verified buyers. Tag #TrainHornDrill on Instagram and yours could land here.
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Verified owners
What people say after the first blast
"Set it off in the driveway and the dog ran inside, and so did I. Louder than my last kit and I didn't have to wire anything."
"I run M18 on the job already, so this was a no-brainer. Snap a battery on, pull the trigger, done."
"Bought it for tailgates. Now my buddies all want one. The remote actually reaches across the lot."
"Build quality surprised me. Trumpets are heavy, the trigger has a real click, the case is solid."
"The chrome version looks insane mounted in the bed. People stop me at the gas station to ask about it."
Measured at the trumpet mouth — louder than most factory truck horns combined.
Wireless remote range, line-of-sight, in real outdoor conditions.
From opening the box to your first blast — even if you've never owned a horn before.
Risk-free
If it doesn't blow you away, send it back.
Try it for 30 days. If you're not happy with the volume, the build, or the way it makes the dog look at you — return it for a full refund. We pay return shipping.
30-Day Money Back
No restocking fees. No "missing accessory" gotchas.
1-Year Warranty
Compressor, electronics, trumpets, remote — all covered.
Customer reviews
Read the unfiltered ones
Loudest thing I've ever fired in a parking lot
I was nervous it'd be a letdown. It is not a letdown. Remote works further than expected and the metal trumpets feel premium.
Bought it for my husband, ended up using it more
Two weeks later it lives in my truck. Super easy to mount and the packs we already had work perfectly.
Solid build, instructions could be clearer
Took a minute to figure out the remote pairing but the quick-start card actually helped. Loud as advertised.
Worth the upgrade over the basic kit
I had a cheaper version before. This one is heavier, louder, and the trumpets don't rattle. Would buy again.
FAQ
Common questions, straight answers
Will it work with my existing batteries?
Yes. Any compatible lithium-ion battery — 1.5Ah, 3Ah, 5Ah, 8Ah, 12Ah — clips straight in. We don't ship a battery unless you pick a kit option that includes one.
How long can I hold the trigger?
The horn will sound continuously until the battery runs out. There is a thermal cutoff that throttles the compressor if you hold past the duty cycle, which protects the pump on long blasts.
Is the 150 dB rating real or marketing?
Measured at one meter from the trumpet mouth, not at twenty meters with the wind helping. Real-world dB drops with distance, like every horn on the planet.
How far does the remote actually reach?
Up to 160 ft line-of-sight. Walls, vehicles, and metal between you and the horn will reduce range — but in open conditions, the entire parking lot is yours.
Can I mount it on a truck or boat?
Yes. The bracket fits standard roll bars, bed rails, under-hood mounts, and most marine handrails. Stainless hardware is included.
Is it street-legal?
Horn legality varies by state and use case. We sell it as an off-road, marine, ranch, and recreational accessory. Check your local codes before installing on a daily-driven vehicle.
How fast does it ship?
Same business day if you order before 1 PM Pacific. We ship from a US warehouse, so most orders land in 2–5 business days.
What if I just don't like it?
30 days, no questions, full refund. We even cover return shipping.
