---
product_id: 39788123
title: "Langbo 3156 Roof Bag, Chrome"
brand: "langbo"
price: "R$162"
currency: BRL
in_stock: false
reviews_count: 8
url: https://www.desertcart.com.br/products/39788123-langbo-3156-roof-bag-chrome
store_origin: BR
region: Brazil
---

# 115 dB sound level Dual heavy-duty compressors Premium Italian quality Langbo 3156 Roof Bag, Chrome

**Brand:** langbo
**Price:** R$162
**Availability:** ❌ Out of Stock

## Summary

> 🚗 Make Some Noise and Command Attention!

## Quick Answers

- **What is this?** Langbo 3156 Roof Bag, Chrome by langbo
- **How much does it cost?** R$162 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/39788123-langbo-3156-roof-bag-chrome)

## Best For

- langbo enthusiasts

## Why This Product

- Trusted langbo brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual Horn Power:** Experience the impact of dual horns for a continuous, attention-grabbing blast.
- • **Unleash the Roar:** Make your presence known with a thunderous 115 dB sound!
- • **Italian Craftsmanship:** Enjoy superior quality with materials sourced from Italy.
- • **Satisfaction Guaranteed:** Shop confidently with our 30-day money-back guarantee.
- • **Hassle-Free Installation:** Get ready to install right out of the box—no extra hardware needed!

## Overview

The Langbo 3156 Roof Bag is a premium air horn system featuring dual horns and heavy-duty compressors, delivering an impressive 115 dB sound level. Made in Italy, this high-quality product ensures easy installation with all necessary hardware included, making it perfect for cars, trucks, and SUVs. Plus, it comes with a 30-day satisfaction guarantee for peace of mind.

## Description

Full description not available

## Features

- ✓ POWERFUL SOUND – The mAuto loud air horn produces one very loud simultaneous sounds. If your goal is to make sure people know you are coming their way then this train horn is what you need. You will get a powerful diesel sound that will make sure others get out of your way.
- ✓ DUAL HORNS – This air horn has dual horns which measure 13” and 15” as well as dual heavy duty air compressors to produce that long and loud continuous sound.
- ✓ PREMIUM QUALITY – This car horn is made in Italy which guarantees you will get superior quality. No cheap materials in this quality air horn so you can rest easy knowing you got a great quality horn at an affordable price
- ✓ EASY INSTALLATION – No need to worry about buying hardware or relays for installation, it’s all included for you to install as soon as the horn arrives. Works great with cars, trucks and SUV’s.
- ✓ CUSTOMER SATISFACTION GUARANTEE: You can shop with confidence knowing all our products are backed with a 30 Day 100% Customer Satisfaction Guarantee. If you are not happy with the product for any reason just let us know and we will be more than happy to issue you a refund.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Langbo |
| Color | Chrome |
| Style | onroof |
| Noise Level | 115 dB |
| Manufacturer | Langbo |
| Model | langbo01 |
| Item Weight | 7.1 ounces |
| Package Dimensions | 16.54 x 6.46 x 4.96 inches |
| Item model number | langbo01 |
| Is Discontinued By Manufacturer | No |
| Exterior | Polished |
| Manufacturer Part Number | 3156 |
| Lift Type | onroof |

## Images

![Langbo 3156 Roof Bag, Chrome - Image 1](https://m.media-amazon.com/images/I/814zrRLWBFL.jpg)
![Langbo 3156 Roof Bag, Chrome - Image 2](https://m.media-amazon.com/images/I/81wGwgfoEqL.jpg)
![Langbo 3156 Roof Bag, Chrome - Image 3](https://m.media-amazon.com/images/I/81ihgnHnJIL.jpg)
![Langbo 3156 Roof Bag, Chrome - Image 4](https://m.media-amazon.com/images/I/71hCMW77TAL.jpg)
![Langbo 3156 Roof Bag, Chrome - Image 5](https://m.media-amazon.com/images/I/61SMNOWFBVL.jpg)

## Questions & Answers

**Q: How long are the trumpets each?**
A: 15" and13"

**Q: One more time. How many db's ?**
A: Since they don't show a db rating on the info page, there is no way to know without a DB meter, and Radio Shack was the last place for an economical unit (IF they were even very accurate).  But, even with a professional meter, distance and angle to the horn's outlet end will make substantial differences,.  As I said in my review, these "dual tankless horns" are surprisingly close to my GMC Duramax Diesel "dual tanked horns" with 125psi in the tank.. about 90% as loud (or higher).  So, even if a db rating was provided, it "don't make a hill of beans" unless you know every single parameter... and accurately at that.  Empirically, they are indeed LOUD, and have the same size horns as my tanked Duramax horns, 13" and 15".  You won't be disappointed.  In fact, you will loose some hearing if you are within a car's length to the horn's outlet.  Pointing them downward helps too (the sound bounces off the street nicely... and they cannot fill with water).  Time will tell how long the Italian pumps last, but since they are intermittent use at best, they will likely last many years with less problems and maintenance than a "tanked" system (since I have both, I know).  If you haven't read my review, I suggest you read it...

**Q: Do the compressors come with mounts??**
A: There's a sleeve on the back of the compressors that slips over the head of a bolt included in the package.

**Q: How many db .**
A: I don't recall, but this horn is very loud! In short, it demands attention! I'm happy with it!

## Customer Reviews

### ⭐⭐⭐⭐ 4.0 out of 5 stars







  
  
    AWESOME horns that DO NOT require a pressurized tank
  

*by R***6 on Reviewed in the United States on October 28, 2017*

AWESOME horns that DO NOT require a pressurized tank.  I installed these high quality (Italian made), metal horns on my new 2018 GMC Denali Acadia, which has absolutely no room for an air tank of any size, let alone the larger "piston type" air pump required to pressurize such a tank.This kit uses TWO, fast acting, "rotary air pumps", that are each, slightly smaller than a Coke can.  This makes them very easy to locate.  On my 2018 Acadia (same model as a 2017), I mounted the two rotary pumps just behind the grill, inside the large OEM pocket provided directly under the hood at the front... right where the hood latch is (at the top, one on each side).  I would have given this mAuto horn kit 5 stars if the kit was more complete with the required wiring and pre-attached female blade connectors.  Not too much of a problem though... 12ga wire (minimum) and crimp-on female blade connectors are all available at any auto parts store.BUT... what made the installation MUCH SIMPLER was the replacement of the two included (cheap "chinesium") 30 amp relays (probably only 20 amps max each at that), with ONE, 100 amp automotive 12 volt relay from McMaster Carr (#7995K41 - High-Current Vehicle Relay, Water-Resistant, SPST-N/O, 12V DC).  This relay is about the same size as the two included relays combined, but the "kit" now requires HALF the wiring as the two original relays would have required, and is a far more stout, American Made relay that will literally last the life of the car.  I mounted this relay in the same "upper pocket area" on my Acadia, behind the grill, as are the two rotary pumps (keeps wiring short).As to the sound, I also own a GMC Duramax diesel truck that I installed the "tried and True", diesel air horns, with a 2-gallon air tank, heavy duty piston pump, pressure regulator switch (preset at 125psi), and the required air solenoid that is parallel wired with my OEM electric horns.  Yes... it is LOUD, but these mAuto horns are not very far behind at all... about 90%+ as loud.  Especially considering there is no pressurized air tank, with all the air line connectors that require maintenance every few months (some connectors require replacing because of multiple leaks, constantly bleeding down tank pressure).  Since there is NO stored air pressure required with rotary pumps, there will be few if any leaks for the life of the installation (and NO high pressure connectors to constantly replace!!)What's also very cool, is that the "tone" of these mAuto horns is nearly identical to my 2018 GMC Acadia OEM electric horns, only MUCH LOUDER!!!  There is a slight 1/2 second delay between the OEM electric horn activation and the mAuto rotary air pump activation, but there is also about a 1/4 second delay on my Duramax pressurized truck horns.  This is because the rotary pumps require that 1/2 second to pressurize the two air lines (one per each pump & horn) before any sound is released.  BUT, once released, boy howdy, is it LOUD!!!Actually, there is a very useful benefit of this 1/2 second delay.  IF you are fast enough to just tap the horn quickly while driving, most of the time, only the OEM electric horns will sound off, and you won't scare the life out of a doddling pedestrian in a crosswalk... but hit the horn button hard, and you will blow that person right back up onto the sidewalk!!!  My Durmax diesel pressurized air horns also have this same "safety feature", but they usually just squeak out an odd sound when tapped quickly.  These mAuto horns won't do that (squeak)... if hit hard, you will get the FULL VOLUME of the air horns!!  So, just a word to the wise... be careful around any cops!!  A very cool setup indeed.....

### ⭐⭐⭐⭐ 4.0 out of 5 stars







  
  
    Like a semi.
  

*by D***T on Reviewed in the United States on January 2, 2017*

Overall, nice loud horn...sounds like a semi/tractor trailer. If you have zero mechanical/electrical skills or knowledge you will have difficulty installing this but if you have intermediate or greater skills...no problem. The reason I am not giving 5 stars is I had to repair one of the compressors. I was halfway through the installation & then noticed the positive and negative terminal posts on one compressor was recessed all the way into the housing. I was about to return it but decided to see if I could repair it. I opened the housing, adjusted the posts (they weren't secured properly during manufacture) and inserted the motor back into the housing. (that was not easy aligning the magnets, coil, & drive shaft). After that I finished the installation and was very delighted by the loud, semi-truck sound now coming from my RV.

### ⭐⭐⭐ 3.0 out of 5 stars







  
  
    Decent, but not what expected.
  

*by W***4 on Reviewed in the United States on July 6, 2017*

It's an okay horn, sounds more like a ship/boat horn to me. Not sure if it's any louder than the first air horn I had installed from a shop. It's still a very decent horn and I'd say it's worth buying if you're looking to change the tone of the horn in your vehicle. Overall, if you just want a horn with a more diesel sound, this is the horn. If you looking to do pranks, look elsewhere.

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-01-27*