---
product_id: 88078198
title: "iGreely DC 5V to DC 9V USB Voltage Step Up Converter Cable 3.3ft/1m Power Supply Adapter Cable with DC Jack 5.5 x 2.5mm or 5.5 x 2.1mm, for Fan, Led Light, Wireless Router, Speakers and More Devices"
brand: "igreely"
price: "$15.14"
currency: USD
in_stock: true
reviews_count: 8
category: "I Greely"
url: https://www.desertcart.us/products/88078198-igreely-dc-5v-to-dc-9v-usb-voltage-step-up
store_origin: US
region: United States of America
---

# 9V DC output power USB 5V input, step-up converter Built-in intelligent IC protection iGreely DC 5V to DC 9V USB Voltage Step Up Converter Cable 3.3ft/1m Power Supply Adapter Cable with DC Jack 5.5 x 2.5mm or 5.5 x 2.1mm, for Fan, Led Light, Wireless Router, Speakers and More Devices

**Brand:** igreely
**Price:** $15.14
**Availability:** ✅ In Stock

## Summary

> 🔋 Power up your gear anywhere, anytime — don’t get left in the dark!

## Quick Answers

- **What is this?** iGreely DC 5V to DC 9V USB Voltage Step Up Converter Cable 3.3ft/1m Power Supply Adapter Cable with DC Jack 5.5 x 2.5mm or 5.5 x 2.1mm, for Fan, Led Light, Wireless Router, Speakers and More Devices by igreely
- **How much does it cost?** $15.14 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/88078198-igreely-dc-5v-to-dc-9v-usb-voltage-step-up)

## Best For

- igreely enthusiasts

## Why This Product

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

## Key Features

- • **Reliable 9V Boost:** Seamlessly steps up USB 5V to a stable 9V DC output, perfect for your essential gadgets.
- • **Smart Safety Circuitry:** Advanced IC chip guards against over-current, over-voltage, overload, and short circuits for worry-free use.
- • **Compact & Portable Power:** 1-meter cable length offers flexible placement—ideal for on-the-go professionals and home setups alike.
- • **Emergency Power Solution:** Keep your WiFi router or speakers running during outages by powering them from any 5V USB source or power bank.
- • **Universal DC Jack Compatibility:** Includes adapters for 5.5x2.1mm and 5.5x2.5mm plugs, powering a wide range of devices from fans to routers.

## Overview

The iGreely DC 5V to 9V USB Step Up Converter Cable is a compact, reliable power adapter that converts standard 5V USB input into a steady 9V DC output with a max current of 0.8A. Featuring built-in intelligent IC protection and versatile DC jack compatibility, it’s designed to power devices like fans, LED lights, wireless routers, and speakers—making it an essential tool for professionals needing portable, safe, and efficient power solutions.

## Description

iGreely DC 5V to DC 9V USB Voltage Step Up Converter Cable 3.3ft/1m Power Supply Adapter Cable with DC Jack 5.5 x 2.5mm or 5.5 x 2.1mm, for Fan, Led Light, Wireless Router, Speakers and More Devices

Review: solid performer - I purchased this thing to power a guitar pedal from the USB jack on my rechargeable PA speaker which I use as a Bass amp. The fist thing I did when it arrived was plug it in and test the output with my scope meter. It puts out a very flat 9v DC. The output tends to be 1/4v high or low, which I would say is within tolerance. The downside is that, even though the plug is the right size for guitar pedals, the polarity of the plug is backwards and the "adapter" that is included doesn't do anything - it doesn't change the size or the polarity. It would have made sense to include a polarity-reversing adapter, but no, I had to use polarity reversal plug that I happened to have on hand (the red adapter in the photo). Once I got the polarity figured out, I was pleasantly surprised at how well this thing powers my fuzz & octave pedals. There is a bit of RF noise, which I mostly solved by slipping a ferrite bead over the power cord and one over the guitar cord.
Review: Center positive changed to center negative and works great! - This is a center POSITIVE cable. I needed center negative and thought I had looked at that detail, but that was my bad. I needed it to connect a guitar pedal (Zoom G3XN) to a large battery powered Bluetooth speaker with USB output, to be able to play without having to plug in somewhere. I cut the cable, wired/soldered red to black and black to red, reversing the polarity, and it works great!

## Features

- Please Note: the cable will not work for devices current more than 0.8A.
- Please Note: the output port is 5.5mm * 2.1mm, also work with port 5.5mm * 2.5mm via the adpater coming in the package, don't work with devices with port 3.5mm x 1.35mm, 4.0mm * 1.7mm, 6.0mm * 4.4mm, 6.3mm * 3.0mm, 5.5mm * 1.7mm, 4.8mm * 1.7mm, please make sure before purchase.
- 【USB 5V to DC 9V Cable】Because the USB input is 5V 2A male, please make sure the current is 2A or the device may not work. The DC output is 9.0V and the max current is 0.8A. Note: NOT suitable for high current equipment
- 【Safe & Reliable】As built in upgraded intelligent IC circuit, our voltage adapter provides your devices perfect protecetion from over-current, over voltage, overload or short circuit
- 【Widely Usage】 It is super convenient for different kinds of devices such as fan, table lamp, bluetooth audio, wireless router, speakers which requires for 9V power. Useful for powering the WiFi router via a power bank or other 5V power source during power outages. Can also be used with other devices that require a 9V power supply

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07JVJ5S2V |
| Best Sellers Rank | #122,033 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #465 in Power Converters #3,463 in USB Cables |
| Brand | iGreely |
| Brand Name | iGreely |
| Cable Type | USB |
| Color | Black |
| Compatible Devices | Speaker |
| Compatible Phone Models | No Compatible Phone Models |
| Connector Gender | Male-to-Male |
| Connector Type | USB Type A |
| Customer Package Type | FFP |
| Customer Reviews | 4.4 out of 5 stars 388 Reviews |
| Indoor Outdoor Usage | Indoor, Outdoor |
| Item Shape | Round |
| Manufacturer | iGreely |
| Maximum Voltage | 9 Volts |
| Model | iGreely |
| Model Name | iGreely |
| Number of Items | 1 |
| Number of Pins | 4 |
| Recommended Uses For Product | Powering devices requiring a 9V power supply, backup power source for WiFi routers during power outages Recommended Uses For Product Powering devices requiring a 9V power supply, backup power source for WiFi routers during power outages See more |
| Specification Met | CE |
| Unit Count | 1.0 Count |
| Wattage | 7.2 watts |

## Product Details

- **Brand:** iGreely
- **Cable Type:** USB
- **Compatible Devices:** Speaker
- **Compatible Phone Models:** No Compatible Phone Models
- **Connector Type:** USB Type A

## Images

![iGreely DC 5V to DC 9V USB Voltage Step Up Converter Cable 3.3ft/1m Power Supply Adapter Cable with DC Jack 5.5 x 2.5mm or 5.5 x 2.1mm, for Fan, Led Light, Wireless Router, Speakers and More Devices - Image 1](https://m.media-amazon.com/images/I/61-pD6OUEkL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ solid performer
*by R***S on October 25, 2023*

I purchased this thing to power a guitar pedal from the USB jack on my rechargeable PA speaker which I use as a Bass amp. The fist thing I did when it arrived was plug it in and test the output with my scope meter. It puts out a very flat 9v DC. The output tends to be 1/4v high or low, which I would say is within tolerance. The downside is that, even though the plug is the right size for guitar pedals, the polarity of the plug is backwards and the "adapter" that is included doesn't do anything - it doesn't change the size or the polarity. It would have made sense to include a polarity-reversing adapter, but no, I had to use polarity reversal plug that I happened to have on hand (the red adapter in the photo). Once I got the polarity figured out, I was pleasantly surprised at how well this thing powers my fuzz & octave pedals. There is a bit of RF noise, which I mostly solved by slipping a ferrite bead over the power cord and one over the guitar cord.

### ⭐⭐⭐⭐⭐ Center positive changed to center negative and works great!
*by R***L on October 7, 2025*

This is a center POSITIVE cable. I needed center negative and thought I had looked at that detail, but that was my bad. I needed it to connect a guitar pedal (Zoom G3XN) to a large battery powered Bluetooth speaker with USB output, to be able to play without having to plug in somewhere. I cut the cable, wired/soldered red to black and black to red, reversing the polarity, and it works great!

### ⭐⭐⭐⭐⭐ Works great for powering guitar effects pedals from a USB power bank (with modification)
*by S***R on May 12, 2022*

This item (iGreely DC 9V USB converter cable) is working great for me in powering guitar effects pedals from a USB power bank, after a simple modification that reverses the polarity of 9V DC at the barrel connector. This product (as received, before the modification) provides 9V DC power in a "center positive" (aka, "tip positive") polarity. (In other words, the outside of the round connector is negative, the inside/center of the connector is positive.) This, however, happens to be the exact opposite of what's needed for powering most guitar pedals. So I opened up the USB connector casing to modify it. (See picture - before the mod.) Note that the two halves are NOT glued together but simply fitted together by means of 6 pairs of posts/holes. Thus the casing can be carefully pried open without damage, and pressed back together again after the modification. Using a soldering iron, I just swapped around the connection points for the two wires, before closing the USB connector halves back together again. This simple modification reverses the original polarity of 9V DC into "center negative" needed by most guitar pedals. As far as the size of barrel connector, it should work with most guitar pedals as is - the outside diameter is 5.5mm, and the inside diameter is 2.1mm. (The package I received also contained a little adapter to convert it to OD 5.5mm/ID 2.5mm, which I didn't use.)

## Frequently Bought Together

- iGreely DC 5V to DC 9V USB Voltage Step Up Converter Cable 3.3ft/1m Power Supply Adapter Cable with DC Jack 5.5 x 2.5mm or 5.5 x 2.1mm, for Fan, Led Light, Wireless Router, Speakers and More Devices
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-01-31*