01
Connect your battery.
Use a compatible Milwaukee M18 battery. Bring your own, or add one to your setup.
Battery sold separately- Up to 130 decibels
- Wireless remoteUp to 300 ft · Included
- Two volume levels
- 450W air compressor
- 1-year warranty90-day returns
- No drill neededComplete standalone horn
- Motor overheat protection
- Battery discharge protection
Train Horn Compatible with Milwaukee M18 Battery
- Up to 130 decibels
- Wireless remoteUp to 300 ft · Included
- Two volume levels
- 450W air compressor
- 1-year warranty90-day returns
- No drill neededComplete standalone horn
- Motor overheat protection
- Battery discharge protection
Want to add accessories?Optional
Apex Dual Train HornIncludes remote · Up to 300 ft
$220.00Free standard US shipping
Same-day shipping for orders placed before noon Pacific, Monday–Friday.
United States: free shipping. Canada: $40. All other supported destinations: $75.Need overnight delivery? Contact us before ordering for availability and a rate.Compatible battery required. Battery and charger sold separately.
Description
Portable Train Horn Compatible with Milwaukee M18 Batteries
Product development, construction and testing details below describe Boss Horn products. HornGuns.com is an official Boss Horn dealer.
Put your Milwaukee M18 18V battery to work in a complete cordless train horn. The compressor, handle and trigger are already assembled, and a wireless remote comes in the box.
- Power: Milwaukee M18 18V battery
- Assembly: Thread the trumpets into the base by hand.
- Operation: Built-in trigger or included wireless remote.
- Package: Standard remote and Quick Start Guide included; battery and charger optional.
An M18 battery supplies the power. The horn supplies the complete setup.
From battery to sound, without an installation
This is a standalone horn, not an attachment that needs a working drill. Screw the metal trumpets into the base by hand, slide on a compatible Milwaukee M18 battery, and operate the built-in trigger. No vehicle wiring or additional assembly tools are required.
The included remote lets you sound the horn without holding the trigger. Its upgraded radio system reaches up to 300 ft, depending on interference, obstacles and the surroundings. An optional long-range remote extends the stated range to up to 2,000 ft.
One M18 platform, a choice of horn layouts
Apex Dual, Apex Quad and the Classic configurations differ in trumpet arrangement and sound. They share the same basic cordless operation. Choose the model in the selector; this page explains the Milwaukee-compatible horn family as a whole.
Two-trumpet models offer two volume levels. Four- and five-trumpet models offer three. Every selection includes one standard remote and a Quick Start Guide.
Purpose-built around the compressor
Boss Horn’s current housing gives the air-compressor motor a secure, dedicated fit. Earlier generations started with modified power-tool shells; developing Boss Horn’s own housing removed the need to dismantle a donor tool and discard its internal parts.
The housing introduced in mid-2026 and the custom control board introduced in mid-2025 are part of Boss Horn’s continuing product development. Metal-alloy trumpets with a powder-coated finish provide durable construction and resistance to corrosion.
Electronics that look after the motor and battery
The control board checks battery voltage at startup and during operation. If the voltage is too low, it stops the motor from drawing the battery down further. Receiver power management also limits the drain that an always-powered radio can cause.
Motor protection tracks operating time to manage heat. If the horn enters its cooling lockout, leave the battery connected and allow about 10 minutes. After disconnecting a locked-out horn, reconnect the battery and allow 10–15 minutes so the timer can complete.
Three ways to power the radio receiver
Always on keeps remote reception available; Always off turns the receiver off. In Standard mode, the receiver stays on for three hours after the battery is connected or after the last horn activation, then switches itself off.
Boss Horn’s testing found that Standard mode protects against deep-discharge damage during months of connected storage, with some tested conditions extending beyond a year. We still recommend removing the battery after use to avoid unintended activation from radio signals.
What to have ready
Bring a compatible Milwaukee M18 18V battery and its charger, or select compatible extras when ordering. The battery and charger are not part of the base horn package.
Your horn is assembled in the USA and covered by a 1-year warranty. The setup is cordless and portable; it does not require a Milwaukee drill or impact driver.
Battery compatibility
Use a compatible Milwaukee M18 18V battery
Choose the horn built for the Milwaukee M18 18V battery platform. A compatible pack supplies power directly to the horn, without a drill in between.
- A battery from another platform is not a substitute for an M18-compatible pack.
- Check the battery platform before choosing capacity or adding an extra pack.
- Battery and charger are sold separately. Use your own compatible accessories or select optional extras.
What’s included?
Your selected setup includes:
- 1 × Apex Dual horn
- 1 × standard wireless remote — one per horn
- 1 × Quick Start Guide — one per horn
Accessories appear here as you add them. Their quantities apply to this order.
Features & controls
Operating your M18-compatible horn
The M18 battery supplies power; the horn’s own electronics handle activation, selectable volume and protection.
Use the trigger or go wireless
- Built-in trigger: press the trigger on the horn handle to activate it.
- Included wireless remote: up to 300 ft range.
- Optional long-range remote: up to 2,000 ft range, sold separately.
Radio range depends on obstacles, interference and the surrounding environment.
Selectable volume
Your M18-compatible horn offers selectable sound levels instead of one fixed output. The trumpet count determines how many settings are available.
Your selected model: 2 volume levels. Two-trumpet models have two levels; four- and five-trumpet models have three.
Give the motor its cooling time
Extended horn use produces heat. The control board tracks operating time and can pause the motor so a cooling period can take place.
- Leave the battery connected. Allow about 10 minutes before continuing.
- If you removed the battery during lockout, reconnect it. Wait 10–15 minutes for the cooling timer to finish, even if the motor has already cooled.
Battery protection at startup and in standby
Protection is built into the horn itself: motor power and wireless standby power are managed separately.
- Motor voltage checks: the board checks battery voltage at startup and during operation. Low voltage prevents the motor from draining a depleted pack further.
- Receiver power management: radio standby power is controlled separately to reduce the drain associated with leaving a receiver on continuously.
Choose the receiver power mode
- Always on
- The wireless receiver stays powered.
- Always off
- The wireless receiver is switched off.
- Standard
- The receiver stays active for three hours after connecting the battery or sounding the horn. Every activation starts a new three-hour window; after it expires, the receiver switches off automatically.
After use: disconnect the battery before storage to help prevent unintended activation from radio signals.
Getting started
- Wear hearing protection and keep people and pets clear before activating the horn. Never sound it near anyone’s ears.
- Screw the trumpets into the base by hand. No tools needed.
- Connect a compatible Milwaukee M18 battery.
- Use the built-in trigger or included remote to activate the horn.
- Remove the battery when you have finished using it.
Warranty & shipping
Your horn is assembled in the USA and includes a 1-year warranty.
Free US shipping. Orders placed before 12 p.m. Pacific Time ship the same business day. We do not ship on Saturdays or Sundays.
Returns are accepted within 90 days of delivery. The buyer pays return shipping.
Find your fit
Compare Milwaukee-compatible horns.
Compare the models available for your battery platform. Sound levels are stated maximums; the battery and charger are sold separately.
| Model | Maximum sound | Volume levels | Horn price |
|---|---|---|---|
| Apex Quad | Up to 150 dB | 3 | $385.00 |
| Classic Quad | Up to 140 dB | 3 | $245.00 |
| Apex Dual | Up to 130 dB | 2 | $220.00 |
| Classic Dual | Up to 130 dB | 2 | $185.00 |
| Classic Five | Up to 140 dB | 3 | $270.00 |
| Xtreme | Up to 150 dB | 3 | $365.00 |
Every model includes a wireless remote, 450W air compressor, motor overheat protection, battery discharge protection and a 1-year warranty. No separate drill is needed.
A closer look
Meet your Apex Dual.
Signature rear caps.
Two trumpets. Apex finish.
A complete handheld unit.
The handle and air compressor are built into the horn base. Thread in the trumpets by hand, then connect a compatible battery.
From box to big sound
Battery in. Big sound out.
A complete horn base. Thread the trumpets in by hand, then connect your battery.
02
Use the built-in trigger.
The handle is part of your horn. You do not need a separate drill or vehicle installation.
03
Or go wireless.
Activate your horn with the standard wireless remote. One is already included in the base price.
Remote includedKnow your horn
Simple setup. Ready to go.
A closer look at the details that make your setup work.
Use the battery you ownMilwaukee M18 compatibility
Connect your own compatible Milwaukee M18 battery. Need one? A 6 Ah battery and compatible charger can be added separately.
No separate drill neededOne complete handheld unit
The trigger, handle and compressor are built into the horn base. Thread in the trumpets by hand; no separate drill or tools are needed.
Go wirelessStandard remote included
One standard wireless remote is included per horn. Add a spare standard remote with a 300 ft range or a long-range remote with a 2,000 ft range.
Real horns. Real stories.
Customer photos and reviews of Boss Horn products, originally published on BossHorn.com. These reviews cover the wider lineup, not only your selected model.
Read the original customer reviews on BossHorn
5.0Amazing
Arrived fast and well packed. A small dent in one horn. It’s gonna happen. Still 5 stars. The sound is just as I hoped. Loud and full on train horn sound. We will use on our ocean boat in the fog. The ferries will love us in bad visibility. Maybe will let my granddaughter know we are in the bleachers at her soccer game as a surprise. Many ideas with the remote option too! Thank you
Billy Monahan
Verified buyer
Verified buyerReviewed: Boss Series Train Horn for DeWalt® 20v Battery
1 / 7
Apex Quad vs.
other horns.
 Apex QuadHorn Guns |  Other hornsBasic alternatives |
|---|---|
 Volume controlAdjustable | Volume controlOne fixed volume. No adjustment. |
 Battery discharge protectionBuilt in | Battery discharge protectionDeep discharge can ruin the battery. |
 Motor overheat protectionBuilt in | Motor overheat protectionOverheating can burn out the motor. |
 Wireless remoteIncluded | Wireless remoteOptional · Extra cost |
| 1-year warrantyIncluded | 1-year warrantyNo warranty included |
Your sound. Your setting.Adjust the volume to suit the moment.
- Care for your battery.
Built-in protection against deep discharge.
- Protection for the motor.
Overheat protection built into Apex Quad.
Comparison covers basic horns without the listed controls, protections or included warranty. Features vary by model and manufacturer.
Build your Apex QuadBuilt around your setup
Why choose Horn Guns?
A complete horn. A team behind it.
Assembled in the USA
1-year warranty
Remote included
Ships same day
Before noon PT, Mon–Fri
- No drill needed
- Cordless & portable
- Fits Milwaukee M18 batteries
- Battery & charger available
Your selected setup
What’s in the box?
The essentials are included. Your optional extras appear here as you select them.
1 × complete Apex Dual hornMilwaukee M18
Included1 × standard wireless remoteOne per horn
Included
1 × Quick Start GuideOne per horn
IncludedA compatible Milwaukee M18 battery is required and sold separately.
Good to know.
Do I need my own drill?
No. The handle, trigger and air compressor are part of the complete horn base. Thread the trumpets into the base by hand, connect a compatible battery and use the trigger or included remote. No tools or vehicle installation are needed.
Is a remote included?
Yes. Every horn includes one standard wireless remote and a Quick Start Guide. You can add an extra standard or long-range remote in the optional accessories on your chosen horn’s product page.
Are the battery and charger included?
The base price includes the complete horn base, trumpets and one standard remote. A compatible battery and charger are sold separately. Use your own, or choose the optional accessories on the product page.
Which battery will fit?
Choose the horn made for your battery: DeWalt 20V MAX, Milwaukee M18 18V, Ryobi ONE+ 18V or Makita 18V LXT. These four battery platforms are not interchangeable. Check the Battery compatibility section on the relevant product page before ordering.
Does it come with a warranty?
Your horn includes a one-year warranty.