---
product_id: 630372554
title: "KZ ZST Bluetooth IEM 5.4 Module IEM Bluetooth Adaper Wireless 2pin 0.78MM for ​KZ ZSTX/AS10,Moondrop CHU II/Aria/Blessing"
brand: "ez ear"
price: "¥9113"
currency: JPY
in_stock: true
reviews_count: 13
category: "Ez Ear"
url: https://www.desertcart.jp/products/630372554-kz-zst-bluetooth-iem-5-4-module-iem-bluetooth-adaper
store_origin: JP
region: Japan
---

# B-pin 0.78mm perfect fit Bluetooth 5.4 ultra-stable 42h total playback power KZ ZST Bluetooth IEM 5.4 Module IEM Bluetooth Adaper Wireless 2pin 0.78MM for ​KZ ZSTX/AS10,Moondrop CHU II/Aria/Blessing

**Brand:** ez ear
**Price:** ¥9113
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your wired IEMs to wireless freedom—because your sound deserves the upgrade.

## Quick Answers

- **What is this?** KZ ZST Bluetooth IEM 5.4 Module IEM Bluetooth Adaper Wireless 2pin 0.78MM for ​KZ ZSTX/AS10,Moondrop CHU II/Aria/Blessing by ez ear
- **How much does it cost?** ¥9113 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/630372554-kz-zst-bluetooth-iem-5-4-module-iem-bluetooth-adaper)

## Best For

- ez ear enthusiasts

## Why This Product

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

## Key Features

- • **Next-Gen Bluetooth 5.4:** Experience lightning-fast, stable wireless audio with AAC codec for crystal-clear sound.
- • **Seamless Compatibility:** Works flawlessly with KZ ZST, ZSTX, ZS10 & more—upgrade your existing IEMs instantly.
- • **Featherlight & Discreet:** At just 4.5g each, these barely-there earhooks deliver comfort and control with a single multifunction button.
- • **All-Day Listening Freedom:** 6 hours per charge + 7 full recharges in case = 42 hours of uninterrupted music.
- • **Dual-Host Mode for Gamers & Pros:** Use earhooks independently with ultra-low latency for gaming or calls without compromise.

## Overview

The KZ AZ09 Bluetooth IEM 5.4 Module is a lightweight, wireless B-pin 0.78mm adapter designed for select KZ and CCA in-ear monitors. Featuring Bluetooth 5.4 with AAC support, it delivers stable, high-fidelity audio with up to 6 hours of playback per charge and a charging case providing 42 hours total. Dual-host mode enables independent earhook use with low latency, making it ideal for gaming and calls. Its compact design ensures a secure, comfortable fit for professionals on the move.

## Description

Product description KZ AZ09 kz az09 bluetooth adapter Ear hook Design The plug-in design with gold-plated pins makes the earphones beacome wireless earphones in seconds,getting rid of the shackles of cables. AAC Advanced Audio Coding KZ AZ09-Professional sound quality comes from the chip and the dual protection of AAC advanced coding ability,bringing natural and clear sound. Operation one-click control KZ AZ09 operation is very simple,just move your finger.You can easily achievea variety of requirements. Rich usage scenarios Whether in daily life or work and play, it can meet your usage needs and enjoy the infinite beauty of music. Long battery life KZ AZ09 Bluetooth ear hook can be used for about 6 hours in a fully charged state,and the charging case can last 8-10 times. KZ AZ09-B Pins,C Pins Bpins Bluetooth Cable for: KZ ZST, ZST-X, ZSTX, EDX, ZSR, AS10, ED12, ES3, AS06 IEM C Pins Bluetooth for :KZ ZSN/ZSN PRO/ZSN PRO-X/ZS10 PRO/ZS10 PRO X/EDX PRO/AS16/AS16 PRO/PR2/ZEX PRO/AS12/AS24/DQS,CCA C12/C10 /CRA

Review: Works great 👍🏻 - I bought 2 of the kz az09 adapters, one for my castor pro’s and one for my zs10 pro’s. At $30.00 these bt adapters are perfect in my opinion. PROS: very good battery life, I use it regularly and charge the case once a week. Sound is really not much different than using a dac. Pretty low noise on these. The sound quality is AWESOME in my opinion. Good distance, probably about 30ft I’d say. Build quality is pretty solid. No issues as of yet. CONS: the only one I can think of is the case is a bit on the large size, and that’s it. Can’t really take away a star for that very minimal issue. 🤷🏼 All in all I highly recommend the the az09 adapters, they do what they are supposed to do, and do it well.
Review: Sound great, long lasting battery (Used 8 hours+) - Gotta have your own headphones! These work wonderful, if your on one device they have no issue connecting. I have issues with multiple devices. As I am switching between three throughout the day. But the sound quality is very clear. The different ear tips make it comfortable as you want.

## Features

- 𝐁𝐫𝐨𝐚𝐝 𝐂𝐨𝐦𝐩𝐚𝐭𝐢𝐛𝐢𝐥𝐢𝐭𝐲- KZ Bluetooth iem adapter provides B-pin 0.78MM/C-pin 0.75MM choices. B-pin 0.78 MM suitable for KZ ZST/ZST-X/EDX/ZSR/ES4/AS10,CCA C10; C-pin 075MM for ZSN PRO/ZSN PRO-X/ZS10 PRO/ZS10 PRO X/ZS12 PRO X/ZS10 PRO 2/EDX PRO/CASTOR/ZAR/PR2/ZAX/AS24/AS24 PRO/ZAS/ZS-X,CCA CRA/C12
- 𝟓.𝟐 𝐁𝐥𝐮𝐞𝐭𝐨𝐨𝐭𝐡 𝐌𝐨𝐝𝐮𝐥𝐞-The iem wireless adapter adopts 5.4 technology which offers you an unparalleled audio experience with faster transmission speed, stronger connection stability. TWS high-definition bluetooth upgrade earhooks, support AAC audio encoding transmission. Hifi sound comes from double protection of chip guard and AAC advanced encoding capabilities.
- 𝐋𝐨𝐧𝐠 𝐁𝐚𝐭𝐭𝐞𝐫𝐲 𝐋𝐢𝐟𝐞-You can get 6 hours usage period per each charge. 800mAh charging case supports 7 times of recharging for both earbuds, gives up to 42 hours continuous music time. Keep you free from mobile charger with music all day!
- 𝐃𝐨𝐮𝐛𝐥𝐞 𝐇𝐨𝐬𝐭- Dual-channel transmission, lower delay. Earhooks can be used individually. The earhook features a high performance mode that gives you faster audio transmission speeds when you play games.
- 𝐋𝐢𝐠𝐡𝐭 𝐖𝐞𝐢𝐠𝐡𝐭 & 𝐏𝐨𝐫𝐭𝐚𝐛𝐥𝐞-Only 4.5g of each earhook, take in ear with 0 pressure. One multi-functional press button for calls, playing, pause and switch music.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D2GYJ7K8 |
| Additional Features | Lightweight |
| Age Range Description | Adult |
| Antenna Location | Entertainment, Calling |
| Audio Driver Type | Dynamic Driver |
| Battery Average Life | 6 Hours |
| Battery Charge Time | 1 Hours |
| Best Sellers Rank | #12,619 in Electronics ( See Top 100 in Electronics ) #79 in Wireless Audio Receivers & Adapters |
| Bluetooth Version | 5.2 |
| Brand | EZ EAR |
| Brand Name | EZ EAR |
| Built-In Media | Wireless Charging Case |
| Cable Features | Without Cable |
| Carrying Case Material | plastic_or_metal |
| Color | AZ09 |
| Compatible Devices | Cellphones |
| Connectivity Technology | Wireless |
| Control Method | Remote |
| Control Type | Media Control or Call Control or Volume Control |
| Controller Type | Remote Control |
| Customer Package Type | FFP |
| Customer Reviews | 3.8 out of 5 stars 152 Reviews |
| Ear Placement | In Ear |
| Earpiece Shape | Rounded tips |
| Enclosure Material | Plastic, Silicone |
| Form Factor | In Ear |
| Frequency Range | 20 Hz - 20,000 Hz |
| Headphone Folding Features | In Ear |
| Headphone Jack | No Jack |
| Headphones Ear Placement | In Ear |
| Headphones Jack | No Jack |
| Is Autographed | No |
| Item Weight | 27.22 g |
| Manufacturer | EZ EAR |
| Model Name | KZ AZ09 B PIN |
| Model Number | KZ AZ09 |
| Noise Control | Sound Isolation |
| Specific Uses For Product | Calling, Entertainment |
| Style Name | Modern |
| Unit Count | 1.0 Count |
| Warranty Description | 1 year |
| Water Resistance Level | Waterproof |
| Wireless Technology | Bluetooth |

## Product Details

- **Brand:** EZ EAR
- **Color:** AZ09
- **Ear Placement:** In Ear
- **Form Factor:** In Ear
- **Noise Control:** Sound Isolation

## Images

![KZ ZST Bluetooth IEM 5.4 Module IEM Bluetooth Adaper Wireless 2pin 0.78MM for ​KZ ZSTX/AS10,Moondrop CHU II/Aria/Blessing - Image 1](https://m.media-amazon.com/images/I/61XEcAvICCL.jpg)
![KZ ZST Bluetooth IEM 5.4 Module IEM Bluetooth Adaper Wireless 2pin 0.78MM for ​KZ ZSTX/AS10,Moondrop CHU II/Aria/Blessing - Image 2](https://m.media-amazon.com/images/I/61cBxigJ1NL.jpg)
![KZ ZST Bluetooth IEM 5.4 Module IEM Bluetooth Adaper Wireless 2pin 0.78MM for ​KZ ZSTX/AS10,Moondrop CHU II/Aria/Blessing - Image 3](https://m.media-amazon.com/images/I/71cMRkuuCKS.jpg)
![KZ ZST Bluetooth IEM 5.4 Module IEM Bluetooth Adaper Wireless 2pin 0.78MM for ​KZ ZSTX/AS10,Moondrop CHU II/Aria/Blessing - Image 4](https://m.media-amazon.com/images/I/71QzsEmuBXL.jpg)
![KZ ZST Bluetooth IEM 5.4 Module IEM Bluetooth Adaper Wireless 2pin 0.78MM for ​KZ ZSTX/AS10,Moondrop CHU II/Aria/Blessing - Image 5](https://m.media-amazon.com/images/I/71WGExOLQ7L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great 👍🏻
*by B***T on October 23, 2025*

I bought 2 of the kz az09 adapters, one for my castor pro’s and one for my zs10 pro’s. At $30.00 these bt adapters are perfect in my opinion. PROS: very good battery life, I use it regularly and charge the case once a week. Sound is really not much different than using a dac. Pretty low noise on these. The sound quality is AWESOME in my opinion. Good distance, probably about 30ft I’d say. Build quality is pretty solid. No issues as of yet. CONS: the only one I can think of is the case is a bit on the large size, and that’s it. Can’t really take away a star for that very minimal issue. 🤷🏼 All in all I highly recommend the the az09 adapters, they do what they are supposed to do, and do it well.

### ⭐⭐⭐⭐⭐ Sound great, long lasting battery (Used 8 hours+)
*by A***R on November 18, 2025*

Gotta have your own headphones! These work wonderful, if your on one device they have no issue connecting. I have issues with multiple devices. As I am switching between three throughout the day. But the sound quality is very clear. The different ear tips make it comfortable as you want.

### ⭐⭐⭐⭐ Great value to make use of existing IEMs
*by Y***Y on August 30, 2025*

For some ~10 year old Alclair IEMs, these were cheaper than a standard cable. As I'm not touring anymore, I just wanted to put the IEMs back to use as headphones... To make them work, I had to shave down the plug area as the B-Pin style didn't fit in the jack recess on the Alcairs, but after that modification, they work fine and are snug. Sound quality streaming audio from an iPhone is just fine. It's not perfect, but for the price point, I'm completely satisfied. The case was a bit of a bonus for me when I saw the IEMs should fit in it as well, unfortunately these custom molded IEMs don't both fit while still connected to these adapters, so I need to pull one and just left the IEM sitting in the case. Not the end of the world, but not ideal.

## Frequently Bought Together

- KZ AZ09 Bluetooth IEM 5.4 Module IEM Bluetooth Adaper Wireless B-pin 0.78MM for ​KZ ZST/ZSTX/ZS10/AS06/AS10/BA10/ZSR/ES4
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- InEar Monitor Case for IEM, in Ear Monitors, in Ears, Headphones, Earphones, Earbuds. Suitable for KZ ZS10/ZS10 Pro/ZSN/ZST/ZEX/AS10/AS16,YINYOO CCZ Melody - GIGCASE®

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-05-26*