---
product_id: 83806460
title: "Airfrex Bluetooth Adapter and Wireless Audio Receiver with Microphone and 2.5mm Jack for Sennheiser HD598 / HD598Cs / HD598SE / HD595 / HD599 / HD559 / HD569 / HD579 / HD518 / HD558 Headphones"
brand: "airfrex"
price: "HK$426"
currency: HKD
in_stock: true
reviews_count: 8
category: "Airfrex"
url: https://www.desertcart.hk/products/83806460-airfrex-bluetooth-adapter-and-wireless-audio-receiver-with-microphone-2
store_origin: HK
region: Hong Kong
---

# Built-in mic for seamless calls Custom fit for Sennheiser HD series Texas Instruments amp chipset for rich sound Airfrex Bluetooth Adapter and Wireless Audio Receiver with Microphone and 2.5mm Jack for Sennheiser HD598 / HD598Cs / HD598SE / HD595 / HD599 / HD559 / HD569 / HD579 / HD518 / HD558 Headphones

**Brand:** airfrex
**Price:** HK$426
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your Sennheiser to wireless audiophile status—because wired is so last decade.

## Quick Answers

- **What is this?** Airfrex Bluetooth Adapter and Wireless Audio Receiver with Microphone and 2.5mm Jack for Sennheiser HD598 / HD598Cs / HD598SE / HD595 / HD599 / HD559 / HD569 / HD579 / HD518 / HD558 Headphones by airfrex
- **How much does it cost?** HK$426 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/83806460-airfrex-bluetooth-adapter-and-wireless-audio-receiver-with-microphone-2)

## Best For

- airfrex enthusiasts

## Why This Product

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

## Key Features

- • **Bass Boost On Demand:** Toggle the preset EQ bass enhancement with a simple double-click to customize your sound profile and feel every beat.
- • **Hands-Free Convenience:** Integrated microphone and one-touch call control keep you connected without interrupting your music flow.
- • **Tailored Wireless Freedom:** Specifically engineered to flawlessly convert your Sennheiser HD series wired headphones into a premium wireless experience.
- • **Audiophile-Grade Amplification:** Equipped with a Texas Instruments headphone amplifier chipset delivering dynamic, powerful sound that drives high-impedance headphones effortlessly.
- • **Cutting-Edge Qualcomm Bluetooth:** Experience lossless, low-latency audio streaming with the latest Qualcomm chipset—no more lag, just pure, crystal-clear sound.

## Overview

The Airfrex Bluetooth Adapter is a precision wireless audio receiver designed exclusively for Sennheiser HD series headphones. Featuring a Texas Instruments amplifier chipset and Qualcomm Bluetooth for lossless, low-latency streaming, it transforms wired headphones into a powerful wireless setup. With an optional bass boost, built-in microphone, and hands-free call controls, it delivers premium sound quality and seamless connectivity tailored for discerning audiophiles.

## Description

Buy Airfrex Bluetooth Adapter and Wireless Audio Receiver with Microphone and 2.5mm Jack for Sennheiser HD598 / HD598Cs / HD598SE / HD595 / HD599 / HD559 / HD569 / HD579 / HD518 / HD558 Headphones: Wireless Audio Receivers & Adapters - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Unsure if i got correct model, doesn't fit HD598 - For all the marketing on this store page that the product is specifically designed for the HD598, it doesn't fit! And I have no clue if I received the correct model (SEHD). There's no model code on the device itself, and the packaging suggests i received the wrong version. The 2.5mm end of the cable that comes with the headphones has two grooves on the side. This is to assist with keeping the cable locked to the headphones. In my photos where i hold the airflex next to the 2.5mm cable, you can see that the airflex has about the same diameter as the 2.5mm cable but doesn't have the grooves, so it won't snap into place. Connecting the device to my phone via bluetooth was very easy. Just a shame i could not hear anything because i can't plug the device into my headphones!
Review: Works as described, no noticeable delay - I can finally brew coffee along with good music! - This deserves more praise - works with my HD 598 flawlessly, and working perfectly as described. 1) I just received it so I cannot comment on the battery life yet 2) So far the audio quality is excellent, identical to that of connections with cables. 3) There is not a delay as obvious as your typical bluetooth speakers, and I can almost say that latency would not be an issue even for games - I'll test it out myself 4) The proprietary plug was a non-issue as they have dealt with that in their design already, it fixes itself into my HD 598 without any issue 5) For those who suffered terrible sound quality, disable your mic (voice input) from the bluetooth connection (AF Lossless Hands-Free AG Audio output), as well as limiting the output to only the AF Lossless Stereo. The terrible audio comes from the "AF Lossless Hands-Free AG Audio output", and it is a common thing for bluetooth audio devices, not a device-specific issue.

## Features

- Custom Made for Sennheiser HD Series Wired Headphones. This wireless music adapter works as a wireless audio streaming converter for the Momentum series headphones, Sennheiser HD598 / HD598Cs / HD598SE / HD595 / HD599 / HD559 / HD569 / HD579 / HD518 / HD558 Headphone replacement cable cord connector and converter.
- Excellent Sound Quality. This Bluetooth audio receiver has a dedicated Texas Instrument headphone amplifier chipset built-in which makes it more dynamic and rich in details. The output is much more powerful, it can drive the over ear headphones with larger impedance, so this is a wireless receiver plus a headphone amplifier and it is perfect match for Sennheiser HD series headphones.
- Optional Bass Boost Feature. Airfrex Bluetooth receiver has preset EQ function which allows users to turn on or turn off the bass enhancement feature if needed, this feature can compensate the bass performance for their headphones or speakers, users just need a simple double click to switch this function.
- Latest Qualcomm Bluetooth Chipset. This wireless stereo adapter applies the most advanced Qualcomm Bluetooth chip which ensures this is lossless in audio transmission which is a huge difference from those low quality Bluetooth adapters. You need a high quality headphone adapter for a good Sennheiser headphone.
- Built-in Microphone for Phone Call. Our music adapter also has built-in Microphone which allow the users to pick up or end a phone call by a simple press on the button, so they won’t miss any phone call even during music listening.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07GVT1K1T |
| Additional Features | Automatic On/Off, Built-In Microphone, Hands-Free Calls, Low Latency, Noise Cancellation |
| Audio Input | 2.5mm |
| Audio Output Mode | Stereo |
| Audio Output Type | Headphone |
| Battery Charge Time | 1.5 Hours |
| Battery Weight | 2.6 Grams |
| Best Sellers Rank | #195,419 in Electronics ( See Top 100 in Electronics ) #664 in Wireless Audio Receivers & Adapters |
| Bluetooth support? | Yes |
| Brand | Airfrex |
| Built-In Media | Bluetooth Module DSP Microphone Battery |
| Color | Silver |
| Compatibility Options | Headphone Speaker Earphone Amplifier Music player |
| Compatible Devices | Headphone |
| Connectivity Technology | Bluetooth |
| Connector Type Used on Cable | Auxiliary |
| Control Method | Touch |
| Controller Type | Button Control |
| Customer Reviews | 2.9 out of 5 stars 41 Reviews |
| Enclosure Material | Aluminum, Metal |
| Hardware Interface | Bluetooth |
| Human Interface Input | Buttons |
| Includes Remote | No |
| Installation Type | wireless |
| Item Weight | 15 Grams |
| Lithium Battery Weight | 2.6 Grams |
| Lithium-Battery Energy Content | 0.4 Watt Hours |
| Manufacturer | Forient Technology Co.,Limited |
| Material | Aluminum , Metal |
| Model Name | SEHD |
| Number of Batteries | 1 Lithium Polymer batteries required. (included) |
| Number of Channels | 2 |
| Number of Lithium-ion Cells | 1 |
| Number of Ports | 1 |
| Power Source | Battery Powered |
| Rechargeable Battery Included | No |
| Special Feature | Automatic On/Off, Built-In Microphone, Hands-Free Calls, Low Latency, Noise Cancellation |
| Supported Application | Spotify, YouTube, MP3, AAC, etc. |
| Supported Media Type | StandardAudioFormats |
| Supported Standards | AAC |
| UPC | 708210350303 |
| Unit Count | 1.0 Count |
| Warranty Description | One Year Warranty |
| Wireless Compability | Bluetooth |

## Product Details

- **Special Feature:** Automatic On/Off, Built-In Microphone, Hands-Free Calls, Low Latency, Noise Cancellation
- **Brand:** Airfrex
- **Connectivity Technology:** Bluetooth
- **Power Source:** Battery Powered
- **Item Weight:** 15 Grams

## Images

![Airfrex Bluetooth Adapter and Wireless Audio Receiver with Microphone and 2.5mm Jack for Sennheiser HD598 / HD598Cs / HD598SE / HD595 / HD599 / HD559 / HD569 / HD579 / HD518 / HD558 Headphones - Image 1](https://m.media-amazon.com/images/I/51j06HoUsDL.jpg)

## Questions & Answers

**Q: How long does the battery takes to charge and how long it last ?**
A: It takes one hour and a half for a full charge and every full charge last 6-8 hours.

**Q: How Heavy is it ?**
A: It weights 10 grams.

**Q: Does it have dual link feature ?**
A: Yes, it has dual link functions which means this adapter can pair with two devices ( two phones or tablets ) at the same time.

**Q: Can I pick up any phone call from this Bluetooth adapter when I am listening music on the phone ?**
A: Yes, it has microphone built-inside. You can pick up or reject any phone calls via the button.

**Q: Is it powerful enough to drive the Sennheiser Headphones ?**
A: Yes, It has dedicated Headphone DAC ( amplifier ) built-inside.

## Customer Reviews

### ⭐ Unsure if i got correct model, doesn't fit HD598
*by K***Y on December 14, 2022*

For all the marketing on this store page that the product is specifically designed for the HD598, it doesn't fit! And I have no clue if I received the correct model (SEHD). There's no model code on the device itself, and the packaging suggests i received the wrong version. The 2.5mm end of the cable that comes with the headphones has two grooves on the side. This is to assist with keeping the cable locked to the headphones. In my photos where i hold the airflex next to the 2.5mm cable, you can see that the airflex has about the same diameter as the 2.5mm cable but doesn't have the grooves, so it won't snap into place. Connecting the device to my phone via bluetooth was very easy. Just a shame i could not hear anything because i can't plug the device into my headphones!

### ⭐⭐⭐⭐⭐ Works as described, no noticeable delay - I can finally brew coffee along with good music!
*by A***N on March 22, 2024*

This deserves more praise - works with my HD 598 flawlessly, and working perfectly as described. 1) I just received it so I cannot comment on the battery life yet 2) So far the audio quality is excellent, identical to that of connections with cables. 3) There is not a delay as obvious as your typical bluetooth speakers, and I can almost say that latency would not be an issue even for games - I'll test it out myself 4) The proprietary plug was a non-issue as they have dealt with that in their design already, it fixes itself into my HD 598 without any issue 5) For those who suffered terrible sound quality, disable your mic (voice input) from the bluetooth connection (AF Lossless Hands-Free AG Audio output), as well as limiting the output to only the AF Lossless Stereo. The terrible audio comes from the "AF Lossless Hands-Free AG Audio output", and it is a common thing for bluetooth audio devices, not a device-specific issue.

### ⭐ Do not buy
*by A***R on April 4, 2026*

Battery life sucks worked ok for the first day and now on the second it literally keeps crashing my pc when I connect it to Bluetooth..... literally testing my computer with 2 other Bluetooth headphones no issues ..... I connect this thing now and I get anywhere between 2 min to 30 min b4 my computer just hard locks it self....... also the mic quality is absolute trash if u try to make a call this stupid pos isn't even glued together properly and this is what happened to it after i wasted 2 hours of my life ripping my pc apart thinking the ram died

## Frequently Bought Together

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-07-12*