- +Complete kit with relay, fuse, harness, and button for $36.99
- +Tankless self-contained design — no air tank or air lines to plumb
- +Zinc-aluminum alloy trumpets instead of bare ABS plastic
- +4.2/5 owner average across 322 Amazon ratings
- +Independent button keeps the stock horn fully functional
- +Compact enough for cars and motorcycles, not just trucks
- −150 dB claim has no test distance and is heavily inflated
- −Dual-note air horn tone, not a true train-horn chord
- −Owner report of the horn failing within months
- −No published frequency, weight, or warranty terms
- −No official brand website or direct support channel
- −QC misses reported: missing button, short harness leads
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: July 30, 2026. Farbin does not operate a standalone brand website — it sells through Amazon, Walmart, and marketplace resellers — so our primary spec source is the brand’s official Amazon listing, cross-checked against secondary retail listings and aggregated owner feedback.
Quick verdict
The Farbin Dual Trumpet Train Horn Kit is a $37 all-in-one loudness upgrade: two zinc-aluminum trumpets, an integrated 12V compressor, an 80-amp relay, a full wiring harness, and a push-button switch in one box. Owners consistently confirm it is dramatically louder than a stock horn and easy to wire, and its 4.2/5 average across 322 Amazon ratings is strong for this price class. What it is not is a 150 dB train horn — that headline number is advertised with no test distance, and compact tankless kits like this one realistically land far below it. We rate it 3.2/5: excellent value as a loud dual air horn, weak on spec honesty and long-term durability signals.
What it is
The Farbin FB-J29 is a compact dual-trumpet electric air horn kit for any 12-volt vehicle — pickups, vans, sedans, SUVs, RVs, and even off-road motorcycles. Unlike true train horn systems, there is no air tank and no separate compressor plumbing: a small 12V motor-driven compressor is built into the horn body and feeds both trumpets directly the moment you hit the button. That tankless, self-contained format (we explain the trade-offs in our tankless train horns guide) is what keeps the kit small — roughly 11.4 × 6.7 × 3.5 inches overall — and cheap.
Farbin itself is a Chinese horn manufacturer established in 2014 (Ruian Fabin Technology Co., Ltd.) that sells almost exclusively through Amazon and other marketplaces. That matters for buyers: there is no official spec sheet beyond the listing, and no brand-direct support channel. For more on the brand’s lineup, see our Farbin reviews hub.
Sound-wise, owners describe a hard, piercing dual-note blast rather than the layered chord of a real train horn. One verified buyer who also owns a $500 air horn in their truck called it “not deep like a high dollar one, but it is deep and loud enough” to get attention — which is about the most honest one-line summary of this product we found. Reviewers repeatedly praise how loud it is for the price, while the one-star minority complains about tone quality and early failures.
This kit is for someone who wants a much louder, deeper horn than stock for the price of a tank of gas — not for someone chasing an actual locomotive-style blast. If that’s you, budget for a tank-based kit instead; our budget train horn roundup covers what the next price tiers actually buy.
Specifications
| Spec | Value |
|---|---|
| Model | FB-J29 (manufacturer part FB-JQLB) |
| Advertised sound output | 150 dB (test distance not disclosed) |
| Trumpets | 2, zinc-aluminum alloy, red finish |
| Trumpet size | 4-1/3 in tall × 2 in diameter |
| Overall kit size | 290 × 170 × 90 mm (≈11.4 × 6.7 × 3.5 in) |
| Power source | 12V DC integrated electric compressor (tankless — no air tank) |
| Compressor | All-copper wire coil, riveted copper internals |
| Relay / fuse | 80A relay, 30A fuse (included) |
| Main power lead | 150 cm red wire, plus black/yellow/blue/white harness leads |
| Materials | Aluminum, copper, zinc (per Amazon listing) |
| Chord frequencies | Not disclosed |
| Weight | Not disclosed |
| Warranty | Not clearly disclosed (“Other” on Amazon) |
| Price | $36.99 (Amazon, July 2026) |
| Owner rating | 4.2/5 from 322 Amazon ratings |
The gaps in that table are telling. No test distance for the dB claim, no frequency chart, no published weight, no stated warranty term. Per Farbin’s Amazon listing, the sound claim is simply “up to 150DB” — and as we detail in our advertised vs real-world decibels guide, bargain horns and premium four-figure kits print nearly identical 150 dB claims — which is exactly why a number with no test distance deserves skepticism. Expect something seriously loud, but not train-horn territory.
What’s in the box
- Dual-trumpet horn unit with integrated 12V compressor
- Mounting bracket with installation hardware
- 80A relay and 30A fuse
- Full wiring harness (150 cm red power lead; black, yellow, blue, and white leads)
- Push-button switch (mounts independently of the stock horn circuit)
That is genuinely everything needed for a basic install — a rarity at this price. One caveat from owner feedback: at least one verified buyer reported the button missing from the box, so inventory the kit on arrival.
Pros
- Complete kit — relay, fuse, harness, button, and bracket included for $36.99
- Tankless and self-contained: no air tank, air lines, or pressure switch to plumb
- Zinc-aluminum alloy trumpets rather than the bare ABS plastic common at this price
- Strong owner satisfaction: 4.2/5 across 322 ratings, 66% of them 5-star
- Independent push-button control keeps your stock horn fully functional
- Compact enough for cars and motorcycles, not just trucks
Cons
- 150 dB claim carries no test distance and is heavily inflated — expect real-world output far lower
- Tone is a dual-note air horn blast, not a deep train-horn chord; owners with high-end systems call it noticeably thinner
- Durability complaints in reviews — one owner reports the horn stopped working after three months
- No published frequency, weight, or warranty terms; no official brand website or support channel
- Some quality-control misses reported (missing button), and the short harness leads complicate clean engine-bay routing
Alternatives
- Vevor 4-Trumpet Train Horn — roughly triple the money gets you four trumpets and a more train-like chord, though with its own inflated dB marketing. See our Vevor 4 Trumpet review.
- Wolo Bad Boy 419 — a compact self-contained dual-tone horn from an established US brand with real published specs. See our Wolo Bad Boy 419 review.
- Wolo 845 Road Warrior DD — a roof-mount option for trucks that want the visual statement along with the sound. See our Wolo 845 Road Warrior DD review.
All three alternatives cost more than the Farbin — that is the point. In this niche, moving from an integrated-compressor horn to anything with an air tank is the single biggest jump in sound quality, and no sub-$50 kit crosses that line.
Install / compatibility notes
The kit reviewed here fits any 12-volt vehicle; the same listing also sells 24V variants, so double-check the voltage option when ordering. Because the compressor is integrated, installation is purely electrical — no air lines. The essentials:
- Mount the horn with the trumpet openings angled downward or level so rain and car-wash water can’t pool in the compressor. Behind the grille or on the core support is typical; check clearance against the kit’s roughly 11.4-inch overall footprint first.
- Wire the included 80A relay per the diagram: the blue and white leads tap the stock horn circuit (or the button), the yellow lead goes to compressor positive, and the red 150 cm lead runs fused (30A) to the battery. Our relay wiring guide covers the same layout generically.
- Ground the black lead to bare metal. Farbin’s own troubleshooting notes call out paint at the grounding point as a cause of weak or intermittent sound.
Per the manufacturer’s wiring notes, reversed compressor polarity produces a whine with no horn sound, and a swapped blue/white pair means the relay never clicks — both are quick fixes. Apart from the 150 cm power lead, the harness wires are short, so plan on splicing extensions if the battery is far from the mounting point. On motorcycles, confirm your charging system can handle the momentary draw through the 30A fuse.
Sources
- Amazon — FARBIN Train Horn for Truck, Dual Trumpet, Red 12V 150dB (ASIN B0CLL8R7M9) — model number, price, 150 dB claim, materials, dimensions, kit contents, relay/fuse/wiring specs, owner rating and review excerpts, manufacturer wiring troubleshooting notes, and Farbin’s “established 2014” brand story
- Alibaba — Ruian Fabin Technology Co., Ltd. company page — manufacturer identity behind the FARBIN brand
Train Horn Hub aggregates publicly available data. We do not test products in-house. All trademarks belong to their respective owners.
A $37 impulse-friendly way to make any 12V vehicle dramatically louder, with everything needed in the box — just buy it as a loud dual air horn, because the advertised 150 dB train-horn blast is marketing, not reality.
Frequently asked questions
Quick answers to the questions people ask most about this topic.
- Is the Farbin dual trumpet horn really 150 dB?
- No independent measurement supports that. The 150 dB figure is Farbin’s advertised rating with no test distance disclosed — the same headline number that appears on everything from bargain horns to four-figure kits. Owners still report it is dramatically louder than a stock car horn.
- Does the Farbin FB-J29 need an air tank or separate compressor?
- No. A small 12V electric compressor is built into the horn body and feeds both trumpets directly, so installation is purely electrical — no tank, air lines, or pressure switch.
- What vehicles does this Farbin horn kit fit?
- Any vehicle with a 12-volt electrical system: pickups, sedans, SUVs, vans, RVs, and off-road motorcycles. The kit measures roughly 11.4 by 6.7 by 3.5 inches, so confirm you have engine-bay or behind-grille clearance before buying.
- What wiring does the kit include?
- An 80A relay, a 30A fuse, a 150 cm red power lead, shorter black/yellow/blue/white harness leads, and a push-button switch. On a full-size truck you may need to extend the shorter leads to reach the battery cleanly.
- Does the Farbin dual trumpet kit come with a warranty?
- Farbin does not clearly publish warranty terms — the Amazon listing gives the warranty description only as 'Other.' In practice, buyers rely on Amazon's standard return window and Farbin's marketplace customer service.
