- +Claimed 150 dB — BossHorn's top output rating — with deep freight-style pitch
- +Real powder-coated aluminum-alloy trumpets (2x14" + 2x12"), not plastic
- +Three volume levels (~110/130/150 dB) for context-appropriate use
- +Encrypted 160 ft remote included; optional 2,000 ft long-range remote
- +Works with any DeWalt 20V MAX battery, 2.0-12.0 Ah — 500+ short blasts claimed on 6.0 Ah
- +1-year warranty plus 90-day money-back guarantee
- −No test distance published for the 150 dB rating
- −Premium price: $300 sale / $450 list
- −Battery and charger sold separately
- −4 lb before battery — noticeably bulkier than the compact Dual format
- −Splash-resistant only, not waterproof
Methodology
This review aggregates publicly available information from manufacturer specifications, retailer listings, and verified user reviews. We do not perform hands-on testing. Last reviewed: August 24, 2026. Primary sources for this article are BossHorn’s official product page for the Extreme Series Train Horn for DeWalt® 20V batteries and BossHorn’s own comparison write-up of its Extreme, Quad, and Dual models. Every number below is a manufacturer claim, and we label it that way.
Quick verdict
The Extreme Series is the flagship of BossHorn’s battery-powered lineup for DeWalt® 20V MAX™ packs: a claimed 150 dB peak through four long powder-coated aluminum trumpets, with a deep, low-pitched tone the brand describes as closest to a real freight train. You get three volume levels, an encrypted 160 ft remote in the box, and an unusually strong guarantee stack for this category — 1-year warranty plus 90-day money-back. The catch is the price ($300 on sale, $450 list) and the usual portable-horn caveat: no test distance is published for that 150 dB figure. We rate it 4.2/5 — the top pick in its niche, marked down for dB-rating transparency and the batteries-sold-separately math.
What it is
The Extreme Series Train Horn for DeWalt® 20V Battery is a handheld, battery-powered “horn gun” — no air tank, no compressor, no install. BossHorn hand-assembles each unit in the USA on a repurposed impact-driver power base, so it clips onto any DeWalt 20V MAX battery from 2.0 to 12.0 Ah and fires either from its trigger or from the included wireless remote. Where the standard Quad model (reviewed here) uses shorter trumpets, the Extreme runs two 14-inch and two 12-inch metal trumpets, which is what pushes both the claimed output (up to 150 dB vs 140 dB) and the pitch down into freight-train territory.
The target buyer is someone who already owns DeWalt® 20V tools and wants maximum portable noise — tailgates, boats, hunting camps, construction-site signaling, event starts — without plumbing an air system into a vehicle. If that’s you but the budget stings, BossHorn’s cheaper Dual and Quad variants share the same battery platform. For a truck-mounted alternative at similar money, see our air-tank kit reviews.
Specifications
All figures below are manufacturer claims from BossHorn’s product page.
| Spec | Value |
|---|---|
| Sound output | Up to 150 dB (manufacturer claim; test distance not disclosed) |
| Volume levels | 3 — soft ~110 dB, medium ~130 dB, full ~150 dB |
| Claimed audible range | Up to 1 mile |
| Trumpets | 4 — two 14” + two 12” |
| Trumpet material | Aluminum alloy, powder-coated |
| Tone | Deep low pitch (“freight train” voicing) |
| Housing | Impact-resistant polymer, splash-resistant |
| Remote | 433 MHz encrypted, 160 ft range, 1 included |
| Optional long-range remote | Up to 2,000 ft (+$59) |
| Power source | Any DeWalt® 20V MAX™ battery, 2.0–12.0 Ah (sold separately) |
| Blasts per charge (6.0 Ah) | 500+ short / ~200 sustained |
| Battery protection | LED low-battery indicator, auto-cutoff at 15% |
| Overheat protection | Auto shut-off at 185°F |
| Weight | 4 lb without battery |
| Dimensions | 14” × 6” × 12” |
| Price | $300 sale / $450 list (Black); Chrome and Red $320 |
| Warranty | 1-year full warranty + 90-day money-back guarantee |
What’s in the box
- Extreme Series horn gun, fully assembled
- 4 powder-coated aluminum-alloy trumpets (2×14” + 2×12”)
- 1 wireless remote (160 ft, 433 MHz encrypted)
Note what’s not in the box: no battery and no charger. BossHorn offers a 6.0 Ah battery for +$30 and a charger for +$30 at checkout, or you use the DeWalt® 20V MAX™ packs you already own. Extra standard remotes run $35; the 2,000 ft long-range remote is $59.
Pros
- Claimed 150 dB — BossHorn’s top output rating — with a genuinely low, freight-style pitch from oversized trumpets
- Real metal trumpets (powder-coated aluminum alloy) instead of the ABS plastic common on portable horns
- Three volume levels (~110/130/150 dB) make it usable at events without always running full blast
- Encrypted 433 MHz remote included; optional long-range remote extends control to a claimed 2,000 ft
- Wide battery compatibility — any DeWalt® 20V MAX™ pack from 2.0 to 12.0 Ah, with 500+ short blasts claimed on a 6.0 Ah
- 1-year warranty plus a 90-day money-back guarantee, unusual for this product category
Cons
- No test distance published for the 150 dB rating — real-world SPL at typical distances will be substantially lower (see our guide on advertised vs real decibels)
- Premium price: $300 on sale, $450 list, before you add a battery or charger
- Battery and charger are sold separately unless you already own DeWalt® packs
- At 4 lb before the battery and with 14” trumpets, it’s noticeably bulkier than the compact Dual format
- Splash-resistant only, not rated waterproof — not a marine-duty device
Alternatives
- BossHorn Extreme Series for Milwaukee® M18™ batteries — the same 150 dB quad-trumpet flagship for the red battery ecosystem; the obvious pick if your tool batteries are Milwaukee® instead of DeWalt®. Our review: /reviews/bosshorn-milwaukee-extreme-train-horn/
- BossHorn Quad for DeWalt® 20V batteries — the mid-tier model: 140 dB claimed, shorter trumpets, and a lower price. BossHorn’s own comparison calls it the sweet spot of power and portability. Our review: /reviews/bosshorn-dewalt-quad-train-horn-20v/
- HornBlasters Outlaw 232 — if you want vehicle-mounted volume rather than portability, a compact air-tank kit delivers sustained honking a battery horn can’t. Our review: /reviews/hornblasters-outlaw-232/
How to choose between the three BossHorn formats? The brand’s own comparison is candid: the Dual reads as “a big truck horn” and suits casual backyard use, the Quad balances output and carry weight, and the Extreme exists purely for maximum impact — the reviewer calls its output “absolutely insane.” In editorial terms: buy the Extreme only if the deepest tone and top-of-line loudness matter more to you than the extra cost. For a broader look at how battery horns stack up against traditional air-tank systems, see our air vs battery comparison and the cross-platform Milwaukee M18 vs DeWalt 20V vs Ryobi 18V battery guide.
Install / compatibility notes
There is no installation: the unit ships fully assembled, and per BossHorn it’s ready to use the moment you click a battery on. A few practical notes drawn from the product page and BossHorn’s comparison article:
- Battery platform
- DeWalt® 20V MAX™, 2.0–12.0 Ah
- Runtime (6.0 Ah, claimed)
- 500+ short blasts / ~200 sustained
- Activation
- Trigger or 160 ft wireless remote
- Receiver auto-off
- After ~3 hours connected (battery protection)
- Battery sizing. Any 2.0–12.0 Ah pack works; bigger packs mean more blasts but more weight on an already 4 lb unit. The claimed 500+ short blasts are quoted on a 6.0 Ah pack.
- Battery protection. The unit cuts off at 15% charge to protect the pack, and BossHorn’s comparison article notes the remote receiver powers down after about three hours of being connected — so a horn left overnight won’t drain your battery.
- Heat. Sustained blasting trips an automatic 185°F thermal shut-off. Let it cool rather than working around it.
- Weather. Splash-resistant, not submersible. Fine in drizzle at a tailgate; don’t leave it in an open boat. See our waterproofing guide for care tips.
- Legality. This is a handheld device, not a vehicle horn, but 150 dB-class noise can still run afoul of local ordinances — check our state legality overview and local noise rules before blasting in town.
Sources
- BossHorn — Extreme Series Train Horn for DeWalt® 20v Battery product page — all specs: 150 dB claim, 3 volume levels (110/130/150 dB), trumpet count/sizes/material, 160 ft & 2,000 ft remote options, 2.0–12.0 Ah compatibility, blasts per charge, weight, dimensions, thermal/battery protection, pricing and variants, warranty and money-back terms, included items
- BossHorn blog — Extreme, Quad, and Dual models for DeWalt® 20v batteries compared — brand’s own positioning of the three models, tone descriptions, three-level volume across the line, ~3-hour receiver auto-off
- BossHorn — Train Horn for DeWalt® 20v Battery collection — sibling Dual/Quad models referenced in the Alternatives section
- BossHorn — Quad Train Horn for DeWalt® 20v Battery product page — Quad’s 140 dB rating and trumpet sizes referenced in comparisons
Train Horn Hub aggregates publicly available data. We do not test products in-house. All trademarks belong to their respective owners.
The Extreme Series is the pick for buyers already on DeWalt 20V batteries who want the loudest, deepest-toned of BossHorn's three main battery formats; casual users get most of the experience from the cheaper Quad.
Frequently asked questions
Quick answers to the questions people ask most about this topic.
- How loud is the BossHorn Extreme Series really?
- BossHorn rates it at up to 150 dB on the full volume setting, with medium around 130 dB and soft around 110 dB. No test distance is disclosed for these figures, so treat them as manufacturer claims — real-world readings at typical listening distances will be lower.
- Does it come with a battery and charger?
- No. It runs on any DeWalt 20V MAX battery from 2.0 to 12.0 Ah that you already own. BossHorn offers an optional 6.0 Ah battery for about $30 and a charger for about $30 at checkout.
- How many blasts do you get per charge?
- BossHorn claims 500+ short blasts or roughly 200 sustained blasts on a 6.0 Ah pack. The unit also cuts off automatically at 15% charge to protect the battery.
- What is the remote range?
- The included 433 MHz encrypted remote works up to a claimed 160 ft. An optional long-range remote extends that to a claimed 2,000 ft for an extra $59.
- How is the Extreme Series different from the standard Quad model?
- Both use four trumpets, but the Extreme runs two 14-inch and two 12-inch metal trumpets while the Quad mixes in shorter ones, and BossHorn rates the Extreme 10 dB louder (150 vs 140 dB) with a deeper, lower pitch. It is also more expensive.
