---
product_id: 117265929
title: "Belker 5.5 x 2.1mm Jack Reverse Polarity Converter Cable"
brand: "belker"
price: "€ 10.34"
currency: EUR
in_stock: true
reviews_count: 8
category: "Belker"
url: https://www.desertcart.pt/products/117265929-belker-5-5-x-2-1mm-jack-reverse-polarity-converter
store_origin: PT
region: Portugal
---

# Supports up to 3A current Reverse polarity tech 5.5x2.1mm male-female plug Belker 5.5 x 2.1mm Jack Reverse Polarity Converter Cable

**Brand:** belker
**Price:** € 10.34
**Availability:** ✅ In Stock

## Summary

> 🔄 Power polarity reversed, convenience amplified!

## Quick Answers

- **What is this?** Belker 5.5 x 2.1mm Jack Reverse Polarity Converter Cable by belker
- **How much does it cost?** € 10.34 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/117265929-belker-5-5-x-2-1mm-jack-reverse-polarity-converter)

## Best For

- belker enthusiasts

## Why This Product

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

## Key Features

- • **Compact & Durable:** 12cm length with Belker’s trusted build quality for long-lasting use.
- • **Power Up to 3 Amps:** Handles up to 3A current ensuring stable and safe power delivery.
- • **Essential Tech Hack:** Avoid costly adapter swaps—just flip polarity and keep your gear running.
- • **Flip Your Power Game:** Seamlessly reverse polarity to match any device’s power needs.
- • **Universal Compatibility:** Works flawlessly with most 5.5x2.1mm AC adapters—baby monitors to keyboards.

## Overview

The Belker 5.5 x 2.1mm Jack Reverse Polarity Converter Cable is a compact, durable solution designed to reverse the center polarity of compatible AC power adapters. Supporting up to 3A current, it ensures seamless compatibility with a wide range of small electronics like baby monitors, keyboards, and speakers. Perfect for professionals who demand reliable power without the hassle of multiple adapters.

## Description

Designed exclusively for Belker Universal Multi-Voltage AC Power Adapter, Also for most adapters with 5.5*2.1mm output plug tip. If your device polarity is contrary to the adapter, please use this cable to convert. Generally applicable to baby monitor, keyboard, speaker, radio, electrical toys, and more small ac electronics with central negative polarity -.

Review: Adapter for Roland JDXI keyboard. - worked as expected. Purchased for a Roland JDXI keyboard which has a negative tip, which is unusual. I purchased this with a Universal USB-C to 3V 4.5V 5V 6V 7.5V 9V 12V Multi-Voltage Adapter DC Cable，PD Trigger Cable with DC-DC Step Down Module, 8 Connector Tips, for Tablets, Led Light, Lamps, Routers Brand: YTADNETH for 6volts for the JDXI This unit only had a positive tip.
Review: This is great but it's unfortunate that we need it! - This reverses the polarity of any 5.5x2.1mm round-tip power cable. It is a necessity if you also purchase the Belker Universal 5V DC Power Cable USB set since that is only tip-positive. Using this adapter cable along with that universal set allows it to work with tip-negative devices. I am grateful that this is available! I'm disgusted by the electronics industry that it's necessary! The industry should abandon all USB-A to Round-Tip power cables. We all have hundreds of USB-A to microUSB or miniUSB cables lying around so that if one cable breaks or gets lost it's no big deal. But since the industry refuses to standardize on anything other than having a USB-A connector on one end of their cables, this Belker Polarity Reversing Cable is great to have on hand!

## Features

- This is a reverse polarity cable.
- 5.5mm x 2.1mm male plug and female plug, 12cm cord length.
- Use to reverse the center Positive output to center Negative or reverse the center Negative to center positive.
- Made by Belker, quality and durable. Max. support 3A Amp current.
- Applicable only to power adapters with 5.5*2.1mm plug end.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07PMHMPMP |
| Brand | Belker |
| Brand Name | Belker |
| Cable Type | reverse polarity cable |
| Color | Black |
| Compatible Devices | Monitor, Speaker |
| Connector Gender | Male-to-Female |
| Connector Type | Dc 5.5mm 2.1mm |
| Customer Reviews | 4.6 out of 5 stars 239 Reviews |
| Indoor Outdoor Usage | Indoor, Outdoor |
| Item Shape | Round |
| Manufacturer | Belker |
| Maximum Current | 3 A |
| Model | 607595800178 |
| Number of Items | 1 |
| Number of Pins | 2 |
| Other Special Features of the Product | Reverse Polarity |
| Recommended Uses For Product | Reversing polarity for small AC electronics, including baby monitors, keyboards, speakers, radios, and electrical toys Recommended Uses For Product Reversing polarity for small AC electronics, including baby monitors, keyboards, speakers, radios, and electrical toys See more |
| Special Feature | Reverse Polarity |
| Specification Met | UL |
| UPC | 607595800178 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Belker
- **Cable Type:** reverse polarity cable
- **Compatible Devices:** Monitor, Speaker
- **Connector Type:** Dc 5.5mm 2.1mm
- **Special Feature:** Reverse Polarity

## Images

![Belker 5.5 x 2.1mm Jack Reverse Polarity Converter Cable - Image 1](https://m.media-amazon.com/images/I/4181rPcgQvL.jpg)
![Belker 5.5 x 2.1mm Jack Reverse Polarity Converter Cable - Image 2](https://m.media-amazon.com/images/I/516sWzWjbgL.jpg)
![Belker 5.5 x 2.1mm Jack Reverse Polarity Converter Cable - Image 3](https://m.media-amazon.com/images/I/41zCAh83kzL.jpg)
![Belker 5.5 x 2.1mm Jack Reverse Polarity Converter Cable - Image 4](https://m.media-amazon.com/images/I/51VkZQbWSgL.jpg)
![Belker 5.5 x 2.1mm Jack Reverse Polarity Converter Cable - Image 5](https://m.media-amazon.com/images/I/51gqmuXmOdL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Adapter for Roland JDXI keyboard.
*by R***M on January 29, 2026*

worked as expected. Purchased for a Roland JDXI keyboard which has a negative tip, which is unusual. I purchased this with a Universal USB-C to 3V 4.5V 5V 6V 7.5V 9V 12V Multi-Voltage Adapter DC Cable，PD Trigger Cable with DC-DC Step Down Module, 8 Connector Tips, for Tablets, Led Light, Lamps, Routers Brand: YTADNETH for 6volts for the JDXI This unit only had a positive tip.

### ⭐⭐⭐⭐⭐ This is great but it's unfortunate that we need it!
*by D***Y on March 26, 2023*

This reverses the polarity of any 5.5x2.1mm round-tip power cable. It is a necessity if you also purchase the Belker Universal 5V DC Power Cable USB set since that is only tip-positive. Using this adapter cable along with that universal set allows it to work with tip-negative devices. I am grateful that this is available! I'm disgusted by the electronics industry that it's necessary! The industry should abandon all USB-A to Round-Tip power cables. We all have hundreds of USB-A to microUSB or miniUSB cables lying around so that if one cable breaks or gets lost it's no big deal. But since the industry refuses to standardize on anything other than having a USB-A connector on one end of their cables, this Belker Polarity Reversing Cable is great to have on hand!

### ⭐⭐⭐⭐ Says What It Does, Does What Is Says, Works As It Should With Some Minor Gripes.
*by D***G on January 22, 2025*

Suggestion for those who don’t speak electricity: double check the specs/manual on your device before ordering to see if you need a polarity converter cable. Google searching your devise's name/model # + AC polarity should do the trick too. Learned this the hard way when I tried to use this set on my Brother P-Touch D400 label maker. Seems Brother uses the less common center-negative configuration in their AC adapters on some of their devises. Ordered the polarity converter for another $6 bucks and all is right with the world. (While you’re at it, double check all the devices you want to use to make sure the specs and included attachments line up to what you need.) I'm docking this 1 Star on three counts - 1. The laughably microscopic instructions and teeny-tiny key. Fortunately the adapter is intuitive enough that you “probably” don’t need instructions ... but that’s just a guess. I don't actually know because I can’t actually read them. Like seriously guys, really? It wouldn't take more than few extra centimeters/inches and font points to save your customers eyes. I'm pretty sure your margins can take the hit. Same with the tiny voltage-dial key. It’s like it was make for a Smurf’s hands or something. It's cute ... but so very, very small and so very, very easy to lose. (Even if you’re not a gifted loser-of-thingies. See photo for suggested work-around as misplacing this sucker pretty much renders the entire set-up useless). Please make it bigger on your next model or at least give the key home on the attachment dock. 3. No converter cable. If I had done my homework the first time I probably would have gone with a different set. Overall though it’s a handy, versatile product and a quite a good value. Well Done Belker!

## Frequently Bought Together

- Belker 5.5 x 2.1mm Jack Reverse Polarity Converter Cable Universal AC Power Adapters Max. Support 3A 3000mA
- Belker 12W 3V 4.5V 5V 6V 7.5V 9V 12V Adjustable Voltage Universal AC/DC Adapter Power Supply for Household Electronics,Micro USB - 1A Max. [BN]
- Belker 45W Universal 5V 6V 7.5V 9V 12V 13.5V 15V AC DC Adapter Power Supply for Household Eletronics LCD LED Strip Light Router HUB Speaker Smart Phone Tablet - Support Amps 0.5A 1A 2A 3A 3000mA Max.

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-09-21*