Farbin 150 dB 4-Trumpet Air Horn Kit Review (2026)

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: September 19, 2026. Farbin does not run a standalone consumer website — the brand belongs to Ruian Fabin Technology Co., Ltd. and sells through Amazon, Walmart and marketplace resellers — so our primary spec source is Farbin’s own Amazon listing for this kit (ASIN B0DJGY6DNQ), cross-checked against the brand’s Walmart storefront, the brand’s Alibaba manufacturer profile, and the aggregated owner feedback attached to that Amazon listing. Loudness context comes from HornBlasters’ published testing methodology. Every source is listed at the end.

Quick verdict

The Farbin 150 dB 4-Trumpet Air Horn is a $45 four-trumpet kit with the air compressor built into the horn assembly — no tank, no air lines, no pressure switch. That is genuinely a lot of horn for the money, and it is currently one of the best-selling air horns on Amazon. But this is also the listing where Farbin’s spec discipline falls apart: the product title says 178 dB, the product description says 150 dB, and neither number comes with a test distance. Worse, the owner feedback skews hard negative on durability specifically. We rate it 3.1/5: a loud, cheap, complete four-trumpet kit that you should buy as a disposable novelty, not as a horn you expect to still be working in two years.

What it is

This is Farbin’s four-trumpet air horn kit in its simplest form: four zinc-alloy trumpets of stepped lengths on a common manifold, with a 12V electric air compressor bolted directly to the assembly. The compressor feeds the trumpets straight through, so there is no tank and no plumbing — mount the unit, run the supplied relay harness to the battery, mount the push-button, done. Farbin sells it as the entry rung of a ladder that climbs to tank-fed 0.8-gallon and 1.6-gallon versions of the same four trumpets.

The buyer this suits is specific: someone who wants the look and the chord of a four-trumpet train horn on a truck, Jeep, van or boat, wants it under $50, and does not want to cut into a frame rail to mount a tank. If you already run onboard air, you are better served by a bare trumpet set — see our Vixen Horns VXH4124B review — because you would be paying for a compressor you do not need. If you want a tank-fed kit at the same budget level, our Vevor 4-trumpet review covers that path. For the difference between these formats generally, see our guides on tankless train horns and single vs dual vs quad trumpet.

Specifications

Spec	Value
Product name	Farbin 4 Trumpet Horn Kit (matte black, with air compressor)
Manufacturer part number	FB-JQLB
Model number	G-FB-J4G
Amazon ASIN	B0DJGY6DNQ
Trumpet count	4
Trumpet lengths	165 mm / 230 mm / 300 mm / 350 mm (≈6.5 / 9.1 / 11.8 / 13.8 in)
Assembly dimensions (L × W × H)	14.37 × 6.89 × 6.89 in
Advertised sound output	150 dB (test distance not disclosed)
Conflicting figure in listing title	178 dB (test distance not disclosed)
Chord frequencies	Not disclosed
Operating PSI	Not disclosed for this compressor-only variant
Voltage	12V
Power source	Integrated 12V electric compressor (no tank)
Material	Zinc alloy; all-copper compressor coil per Farbin
Weight	Not disclosed
Colour options	Matte black, silver, red
Warranty	1-year manufacturer warranty per the Amazon item details
Price (Amazon, 09/19/2026)	$44.99
Price (Walmart, 09/19/2026)	$59.99
Owner rating	4.1 / 5 from 492 Amazon ratings
Amazon category rank	#12 in Air Horns

Format

Tankless — compressor integrated into the horn

Install type

Electrical only, no air plumbing

Price band

$44.99–$59.99 depending on retailer and colour

Best for

Cheap four-trumpet sound on a 12V vehicle

Two things in that table deserve calling out. First, the decibel figure is not just undisclosed as to distance — it is internally inconsistent. Farbin’s own listing title advertises 178 dB while the product description for this exact variant states 150 dB. Second, PSI is simply absent for this variant. Farbin publishes 150 PSI for the tank-fed versions but nothing at all for the integrated compressor, which makes it impossible to compare this kit’s output to a tanked system on paper.

For what those numbers mean in practice: HornBlasters, which publishes its test methodology, reports the Nathan Airchime K5 locomotive horn at 149.4 dB at 3 feet as the loudest horn it has ever measured, and calls 150-plus dB claims for vehicle horns physically impossible. A compact tankless kit like this one will sit well below that. Our editorial estimate — an estimate, not a measurement — is that this kit lands in the 120s at 3 feet, similar to the compact Farbin kits we have already covered. Our guide on advertised vs. real decibels explains why the gap is this wide, and how to measure train horn dB covers metering it yourself.

What’s in the box

• Four zinc-alloy trumpets on a shared manifold (165 / 230 / 300 / 350 mm)
• Integrated 12V air compressor with all-copper coil
• Relay wiring harness
• Push-button horn switch
• Screws and mounting hardware

That is the complete list. There is no air tank, no pressure switch, no air gauge, no air line and no quick-connect fittings — which matters, because several owners specifically wished the kit shipped with more quick connectors so they could angle the trumpets differently. Farbin also does not include printed installation instructions, a complaint that shows up repeatedly in owner feedback.

Pros

• Four-trumpet chord for $44.99 — by a wide margin the cheapest way to get four trumpets and a compressor in one box
• No air plumbing at all: mount it, wire the relay, mount the button, done
• Zinc-alloy trumpets rather than the ABS plastic used on some sub-$40 horns
• Farbin discloses a 1-year manufacturer warranty on this listing — better than the “Other” placeholder on some of the brand’s other kits
• Independent push-button keeps the factory horn fully functional
• Strong distribution: currently #12 in Amazon’s Air Horns category, sold by Farbin and fulfilled by Amazon, with free 30-day returns on both Amazon and Walmart

Cons

• The listing contradicts itself on loudness — 178 dB in the title, 150 dB in the description — and neither figure discloses a test distance
• No PSI, no chord frequencies and no weight published for this variant, so it cannot be compared on paper to a tank-fed kit
• Durability is the single worst-scoring theme in owner feedback
• No printed install instructions in the box, and no quick-connect fittings for re-angling the trumpets
• Amazon pools ratings across the whole variant family, so the headline 4.1/5 blends this kit with the $120–$140 tank versions
• Farbin has no consumer website or direct support channel — warranty service runs through marketplace messaging

What owners report

Aggregated owner feedback on the Amazon listing is genuinely split, and the split is informative. Volume is the most-discussed attribute, and the positives are emphatic — one owner writes that it “sounds just like a train horn” — while a meaningful minority say it is quieter than they expected, with one reporting their car’s factory horn was louder. Several owners describe the tone as a loud multi-tone blast rather than a locomotive chord, with one comparing it to “a louder version of a Volkswagen Beetle horn.”

Installation feedback splits too, with “quick and easy install” on one side and bent parts, insufficient wire length and missing instructions on the other. One owner reported having to hire a professional to mount the assembly on a Ford F350.

Durability is where the picture turns genuinely bad: negative comments dominate the theme, and the failure reports are consistent enough to take seriously — a compressor that quit after three weeks, a solenoid that failed at two months, a pressure switch that failed at four, and at least one report of melted 12-gauge wire. Treat all of this as user-reported, not verified, and note the important caveat above: Amazon merges reviews across the variant family, so some of these reports — the pressure-switch failures and a complaint that the compressor “doesn’t reach 150 psi” — describe the tank-fed kits, not this compressor-only version. Our guide on how long air horns last puts these timelines in context.

Alternatives

• Vevor 4-Trumpet Train Horn Kit — roughly double the price, but you get a real 1.6-gallon tank, a pressure switch and a gauge, which is the format most buyers actually picture when they say “train horn.”
• Vixen Horns VXH4124B — around $92 for an all-metal four-trumpet set with a 12V solenoid and no compressor. The better buy if you already have onboard air and want the fullest chord per dollar.
• Farbin Dual Trumpet 150 dB Kit — the same idea from the same brand for about $37, with two trumpets instead of four. If you mostly want “much louder than stock” in a compact package, the dual is the cheaper, smaller version of this bet.

If your budget stretches further, our best train horn under $200 guide covers the point where kits start disclosing real specs.

Install / compatibility notes

This is an electrical install, not an air-system install, which is the kit’s biggest practical advantage. Farbin specifies any 12V vehicle — pickups, SUVs, vans, cars, Jeeps, boats and buses — and sells a 12/24V variant separately if you run a 24V truck.

1. Find a mounting spot with clearance for the full 14.37 × 6.89 × 6.89 in assembly and point the trumpet mouths down or rearward so they do not scoop road spray. Our guide on where to mount a train horn covers the usual locations.
2. Wire through the supplied relay — never through the factory horn circuit. Farbin’s own listing warns that the button lead and the ground lead in the harness are easy to swap, which is the most common reason a new install does nothing at all.
3. Fuse it properly. At least one owner reported melting 12-gauge wire on this kit, so size the feed conservatively; our amp draw, fuse and wire gauge guide and relay wiring guide walk through the calculation.
4. Expect to extend the harness on a full-size truck — short leads are a recurring complaint — and to buy your own quick-connect fittings if you want to re-angle individual trumpets.
5. Bench-test before final mounting. If it clicks but no air moves, the compressor is the usual suspect; see train horn troubleshooting.

Owner-posted install walkthroughs for Farbin kits exist on YouTube, including a general install video and a follow-up covering an auxiliary air-fitting upgrade; both are listed in Sources.

On legality: a horn this loud is not street-legal everywhere, and several states regulate aftermarket horns by audibility or by prohibiting sirens and whistles outright. Check our state legality pages and are train horns legal on cars before you install.

Sources

• Amazon — FARBIN Truck Air Horn Train Horn 4 Trumpet Car Horn (ASIN B0DJGY6DNQ) — Farbin’s own listing — the source for every spec, price, part number, warranty, rating and owner-feedback figure in this review
• Walmart — FARBIN Truck Air Horn 150DB Train Horn 12V 4 Trumpet (item 6167615471) — price cross-check ($59.99), seller and returns policy
• Amazon — FARBIN 178dB 4 Trumpet Horns with 0.8 gal Air Tank (ASIN B0CLDHY2VW) — tank-fed sibling kit; confirms which variants carry the 178 dB and 150 PSI figures
• Amazon — FARBIN Train Horn with 6L / 1.6 gal Air Tank (ASIN B0CJ66LWKK) — top rung of the same four-trumpet family ($139.99)
• Amazon — FARBIN brand store — confirms Farbin has no separate consumer website
• Alibaba — Ruian Fabin Technology Co., Ltd. supplier profile — corporate identity behind the Farbin brand
• HornBlasters — Why fake decibel ratings mislead buyers — the 149.4 dB at 3 ft Nathan K5 benchmark and why test distance must be stated
• YouTube — “HOW TO: Farbin Train Horn install” — owner-posted install walkthrough for a Farbin kit
• YouTube — “HOW TO: Farbin Train Horn UPGRADE: AUX Air Fitting install” — owner-posted follow-up covering an auxiliary air-fitting modification

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