FAQ

We have listed many common concerns that customers may have, and you can check here to see if they can solve the problem. Before contacting us, reading here can help you solve the problem more quickly.

Product warranty​

1. Earphones: The main body of the earphones is covered by a 1-year warranty, and the earphone cable is also covered by a 1-year warranty; silicone ear tips, earphone cases, and other accessories are not covered by warranty.
2. Audio Cable: 1-year warranty.
3. DAC & Amp Adapter: 1-year warranty.
4. Audio Adapter: 1-year warranty.
5. Storage case, cable clip, leather cases, and earphone case: No warranty coverage.
All the above products are eligible for a 7-day no-questions-asked return policy, excluding customized products.
(Additionally, silicone ear tips sold separately are skin-contact products and, in principle, do not qualify for the 7-day no-questions-asked return policy unless there is a quality issue.)
1. During the warranty period, products with defects caused by non-human factors are eligible for free repair services. For certain products, replacement may be offered instead of repair at the discretion of the manufacturer. The final resolution will be determined based on the actual inspection results of the returned product.​​
2. When submitting a product for repair, please include a note detailing the issue encountered and the return shipping information to facilitate faster processing. Additionally, kindly enclose proof of purchase (e.g., receipt/invoice/purchase record) for warranty validation.​​
3. Please do not send the package with freight collect. Thank you for your cooperation!

TC44Grip DAC & Amp Adapter

No, the TC44Grip does not come with a built-in battery. When connected to a smartphone, you can charge the phone by connecting an external power source to the TC44Grip’s USB-C PD fast-charging port.
The colors of the TC44Grip’s indicator light correspond to the sampling rates of the audio being played:
Blue light: PCM decoding ≤ 48kHz
Green light: PCM decoding ≥ 88.2kHz
White light: Native DSD output
The TC44Grip features a right-angle plug design, primarily optimized for smartphone use. Due to differences in charging mechanisms between laptops and smartphones, it is not possible to charge the laptop while listening to audio via the TC44Grip’s USB-C port.
The 3.5mm output of the TC44Grip supports in-line call control compliant with the CTIA standard. However, please note that the in-line call control function will become inactive when the “USB Exclusive Mode” is enabled in the music app on your smartphone.
Additionally, when connected to a Huawei HarmonyOS smartphone, the TC44Grip does not support making calls via phone numbers. It only supports voice recording and in-app voice calls on the device.
Currently, among OPPO’s Find series, only the X8 model supports simultaneous audio playback and charging when connected to the TC44Grip. All previous models in this series are incompatible.
We will update this information here if any other incompatible smartphone models are identified in the future.
The P85M and P95M magnetic attraction pads require use with smartphones or phone cases equipped with a MagSafe magnet ring.
P85M: Ideal for phones with lower-positioned magnetic charging areas, typically those with larger camera modules. Examples: vivo X200 Ultra, Xiaomi 15 Ultra, Oppo Find X8 Ultra, etc.
P95M: Suited for phones with higher-positioned magnetic charging areas, generally near the center. Examples: MagSafe-equipped iPhones, Samsung S series, etc.

TC44Pro E3 DAC & Amp Adapter

No, it does not.
Yes, it does.
1) The PCM/DSD indicator light has 2 color modes:
Blue: Indicates PCM decoding output;
Green: Indicates native DSD decoding output;
2) Gain indicator light: A solid yellow light indicates the high-gain mode.

TC44Pro M3 DAC & Amp Adapter

No, it does not.
For Android smartphones equipped with the Snapdragon 8 Gen3 processor (e.g., Xiaomi 14 Pro), stuttering may occur when USB Exclusive Mode is enabled. We recommend disabling USB Exclusive Mode or using the Apple Music App. This compatibility issue requires a firmware update from the smartphone manufacturer to resolve.

TC44Pro E2 DAC & Amp Adapter

The blue light on the TC44Pro E2 indicates PCM output, while the green light indicates native DSD decoding output. To achieve this:
1. Please ensure that the audio source is in DSD format (file extensions are typically .dff, dsf, or .diff).
2. The music software used can support DSD format, and relevant manual settings are required.
(For Hiby Music on Android: Go to Playback Settings > Enable “Exclusive HQ USB Audio Access” and select “Native” for DSD output mode. For iPhone: Go to Playback Settings > Enable “DoP.”)
Based on testing, the USB-C version of the TC44Pro E2 is compatible with the iPhone 15/16/17 series.
This is because the iPhone’s Lightning port has power limitations for external devices. When the volume exceeds a certain level (e.g., above 80%), it can surpass the power limit, causing playback to stop. In this case, you can restore normal operation by unplugging and re-plugging the DAC dongle and then adjusting the iPhone’s volume to a lower and more moderate level before resuming playback.

TC44Pro 43198 DAC & Amp Adapter

Based on testing, the USB-C version of the TC44Pro is compatible with the iPhone 15/16 series.
No, the TC44Pro (43198) does not support the inline microphone function, because it features a 4.4mm balanced headphone output, while inline headphones typically use a 3.5mm connector, making them incompatible.
This is because the iPhone’s Lightning port has power limitations for external devices. When the volume exceeds a certain level (e.g., above 80%), it can surpass the power limit, causing playback to stop. In this case, you can restore normal operation by unplugging and re-plugging the DAC dongle and then adjusting the iPhone’s volume to a lower and more moderate level before resuming playback.
Firstly, please plug the TC44Pro into the iPhone, ensuring it is securely connected. Then, swipe down from the top right corner of the phone’s screen to open the music playback module. If “TC44Pro” is displayed, it indicates that the TC44Pro has been correctly detected by the iPhone.
The blue light on the TC44Pro indicates PCM output, while the green light indicates native DSD decoding output. To achieve this:
1. Please ensure that the audio source is in DSD format (file extensions are typically .dff, .dsf, or .diff).
2. The music software used can support DSD format, and relevant manual settings are required.
（For Hiby Music on Android: Go to Playback Settings > Enable “Exclusive HQ USB Audio Access” and select “Native” for DSD output mode. For iPhone: Go to Playback Settings > Enable “DoP.”)

TC35Pro M2/E2 DAC & Amp Adapter

No, the TC35Pro M2/E2 do not support in-line controls.
The blue light on the TC35Pro M2/E2 indicates PCM output, while the green light indicates native DSD decoding output. To achieve this:
1. Please ensure that the audio source is in DSD format (file extensions are typically .dff, .dsf, or .diff).
2. The music software used can support DSD format, and relevant manual settings are required. （For Hiby Music on Android: Go to Playback Settings > Enable “Exclusive HQ USB Audio Access” and select “Native” for DSD output mode. For iPhone: Go to Playback Settings > Enable “DoP.”）
Yes, it is normal to hear a slight pop sound when changing songs with the TC35Pro M2/E2.
This is due to the operational amplifier chip in the TC35Pro M2/E2, which has a relatively loud power-up sound. Actually the internal circuitry is already equipped with an electronic switch to minimize this pop sound, the current popping sound has already been reduced to the lowest feasible level.

TC35M2 / TC35CM2 DAC & Amp Adapter

Yes, the TC35M2 / TC35CM2 dongle supports in-line calls, and the connected headphones must be of the CTIA standard for in-line control.
Due to differences in the internal protocols of line control, iPhone-specific line control headphones connected to the TC35M2 / TC35CM2 do not support volume adjustment and only support play/pause and call functions.

TC28CPro DAC & Amp Adapter

No, the TC28CPro adapter does not support fast charging. It comes with a standard black charging cable, and it’s recommended to use this cable for charging. Using a fast charging cable (especially with a fast charger) may pose a risk of damaging the connected devices, so it is not advised to use fast charging cables with the TC28CPro adapter.
When the TC28C Pro is connected to an external power source, it can only charge the connected smartphone or tablet, not the DAC dongle.
This limitation is due to the differences in the internal USB protocols among various Android phone brands. Some models may experience the above-mentioned compatibility issues when used with the TC28CPro, such as certain OPPO and Redmi phones.
Starting in 2024, the iPad series use a new charging protocol, which TC28CPro is not compatible with.

TC28i Pro DAC & Amp Adapter

Fast charging is supported. The adapter comes standard with one black regular charging cable. For charging, it is recommended to use this cable to connect the TC28i Pro adapter to a power source for iPhone charging.
The TC28i Pro does not support docking stations, nor is it compatible with USB flash drives, card readers, or external hard drives.”
This is because the Lightning interface of Apple devices has limitations on external power supply. When using OTG cables/adapters with a 5V boost power supply scheme (such as the TC28i Pro), if the external decoding device (e.g., the FiiO KA17 dongle) consumes too much power, it may not be compatible for use.

TC28i M2 DAC & Amp Adapter

This is because the Lightning interface of Apple devices has limitations on external power supply. When using OTG cables/adapters with a 5V boost power supply scheme (such as the TC28i M2), if the external decoding device (e.g., the FiiO KA17 dongle / QX13 DAC) consumes too much power, it may not be compatible for use.
No, the TC28i M2 does not support charging. It is exclusively designed for connecting to DAC devices via conversion.
No, the TC28i M2 does not support wireless Bluetooth functionality.

TC01A / TC01C Audio Adapter

Yes, it can.

TC35i DAC & Amp Adapter

It uses MFi certified Lightning chip and connector, so you are rest assured that there will be no compatibility issue. But owing to some restrictions, the TC35i, as well as other third-party earphone-related finished products, is unable to get the MFi certification.
It supports all the functions of Apple headset, including in-line controls and microphone; it supports most of the functions of CTIA standard earphones, including play/pause and answering phone call, but can’t adjust volume.
The TC35i uses official connector and chip, the audio signal will only go through the decoding and amplification. Owing to the cable-free design, it can largely reduce the influence to sound quality. The all-metal shell can more effectively shield electromagnetic interference and further ensure the lossless transmission of sound quality. So it‘s supposed to have an overall better sound quality than the Apple official adapter.
The audio output for iSO products are commonly fixed. When using the TC35i, the sampling rates is 48KHz. Sorry that there are no other detailed data can be shared.

TC35B DAC & Amp Adapter

It’s tested to be compatible with various of Type-C smartphone from brands such as Samsung, Xiaomi, Oppo, Vivo, Meizu, Huawei, etc. All the phones have no issue in playing music, but some of them don’t support in-line control volume adjustment.
Yes.
If you find the in-line control volume adjustment invalid or other issues, it’s suggested to take out the earphone and use the microphone to answer your phone call. Since the line control function of phone differs from brand to brand, and some phones have special specifications for accessory agreement, so that it may make them not compatible that perfectly.
The Type-C interface on the phone would have gone through dozens of high-strength tests during the production, and the force of using the adapter is almost the same as that of using the charging cable. So if use properly, there is no need to worry about damage.

TC01A / TC01C Audio Adapter

Yes, it can.

DJ44AR/DJ35AR Audio Adapter

Since the DJ35AR/DJ44AR plug is made of rhodium plated copper, which is very sensitive to all kinds of marks, such as finger prints, dust, etc. So we’ve provided a small wiper inside the package, so that you can clean the plug before use so as to make sure it works perfectly.

DJ44B / DJ44C Audio Adapter

The 4.4mm socket is much bigger than the 2.5mm socket, if we still use transparent plastic housing, the wall thickness should be thicker as well, eg, the minimum required thickness is 0.4mm if use stainless steel, but would be 1mm if use plastic, which would be hard to make it as small and compact as possible. In order to make it solid as well as compact, we use the more expensive 316 stainless steel as its material.
For the DJ44B/DJ44C, we use high purity 6N OCC for internal wiring, high fidelity soldering tin for the soldering, and high quality gold-plated layer for the socket and plug. All of these make sure the transmitting signal is reliable enough, so as to guarantee the sound quality is as lossless as possible.
This is caused by the increased cost on the product processing and high quality materials. The housing and the cover are all metal and they are all processed by CNC-ed machining. One thing that needs to be mentioned is the cutting tool requires to change to a new one after processed tens of stainless steel products. In order to provide better user experience, the cost is correspondingly higher.
We’ve been asked this question before. This adapter is a dedicated accessory for earphones by switching between different plugs, it’s not a mini speaker or others.

DJ35A / DJ44A Audio Adapter

need to short out the two negative poles of the balanced output, which will possibly damage the output device, so it’s not suggested to use in this way.
There are many factors that may affect the sound quality, but for an adapter, the determining factor is the gold-plated layer. For all the DJ series products, we use high quality copper with thick galvanized gold-plated layer, to make sure it has good electrical property with the connecting points on the female jack. What’s more, the FPCB connection is very short, which has very limited effect to the sound quality.
The connection on the 2.5mm female side may be a little bit tight, so please make sure the earphone is well plugged in.

DJ44S M1 / DJ44S MAX Audio Adapter

Both of these products are designed for Sony players. The DJ44S M1 is designed exclusively for SONY NW-WM1A and NW-WM1Z, while the DJ44S MAX is designed exclusively for SONY NW-WM1AM2 and NW-WM1ZM2.

DJ44K M2 Audio Adapter

The DJ44K M2 is specifically designed for Astell&Kern players and is suitable only for those models that have both 2.5mm and 3.5mm outputs, but no 4.4mm output.
Compatible models include Astell&Kern SE200, SE100, SA700, SP2000, SP1000, SP1000M, SR25, SR15, AK70, AK70MKII, AK100II, AK120II, AK240, AK380, KANN, and KANN CUBE.
The DJ44K M2 adapter features a specially designed step (approximately 2mm high) on both plugs, allowing it to be connected directly without interference from the player’s leather case or protective cover.

TC19CC Flagship Pure Silver Digital Signal Cable

1. The TC19CC cable is not compatible with the following devices: Mojo2, HiBy music players, QLS MUB1, FiiO K15/K17/K19/KA17/M15S, and Sony Xperia 1 V.(This list will be updated continuously if additional incompatible device models are identified.)
1) Connection to Lotoo Mjölnir: Unstable performance may occur when using the USB output of devices such as Astell&Kern (AK) players, Xiaomi 13, and Xiaomi 15 to connect to the Lotoo Mjölnir.
2) Using a player as an external USB DAC: Unstable performance may occur when connecting to Astell&Kern (AK) players for use as external DAC/amps.
3) Not compatible with Questyle M15i dongle.

TC09L / TC09S Audio Cable

The materials for both cables are completely the same, but the main differences are: 1.The TC09L cable features dual angled connectors, while the TC09S cable has dual straight connectors. 2.The TC09L cable is directional: when connected in the forward direction, it can be used to connect one decoding device, and when connected in the reverse direction, it can serve as a charing cable. In contrast, the TC09S cable is bidirectional, which means there is no need to distinguish the connection direction when connecting it to a decoding deviceand, and it does not have charging function.

TC05 M2 Audio Cable

Both models are entry-level OTG cables, with the TC05 M2 being the second generation of the TC05 series cables.
1.The plug designs are different; the former features a slim waist and trumpet-shaped opening, which better protects the cable.
2.The TC05 M2 uses an oxygen-free copper wire core with oxygen-free copper silver-plated shielding, and its wire diameter is thicker, while the TC05 has a single crystal copper silver-plated wire core (without shielding).
3.The TC05 M2 cable is directional: when connected in the forward direction, it can be used to connect one decoding device, and when connected in the reverse direction, it can serve as a charing cable. In contrast, the TC05 is bidirectional, which means there is no need to distinguish the connection direction when connecting it to a decoding device, and it does not have charging function.

MFi05 M2 Audio Cable

Please be advised that the MFi05 M2 has been tested and found to be incompatible with the Cayin RU6 / RU7 Dongle DAC, and lotoo PAW1.

TC03SS / TC03SL / TC03LL Audio Cable

The TC03SS/TC03SL/TC03LL OTG cables do not have a charging function and do not support charging.

BC44Pro Audio Cable

The ground wire of the BC44Pro cable is designed to be floating, with its ends not connected to the casing. For certain headphone amplifiers, a “ground” connection is required for the audio cable in specific modes, such as the L&P EA4 in ‘ILA’ mode. So the BC44Pro is not suitable for this, and which case you can choose the BC44Net cable with grounded design.

Memory Earphone

1. Yes, the Memory supports in-line control. The specific operations are as follows:

a. Short press: Play/pause music or answer calls.

b. Long press: End calls during a conversation.

c. Track control (functionality depends on the music app):

-Double press quickly: Next track.

-Triple press quickly: Previous track.

d. No in-line control for volume adjustment.

2. The Memory is equipped with a microphone. However, please note the following when connected to a HarmonyOS smartphone:

a. It does not support making calls via phone numbers.

b. It only supports voice recording and in-app voice calls on the smartphone.

M198C earphone Cable

1. Yes, the Memory supports in-line control. The specific operations are as follows:

a. Short press: Play/pause music or answer calls.

b. Long press: End calls during a conversation.

c. Track control (functionality depends on the music app):

-Double press quickly: Next track.

-Triple press quickly: Previous track.

d. No in-line control for volume adjustment.

2. The M198C is equipped with a microphone. However, please note the following when connected to a HarmonyOS smartphone:

a. It does not support making calls via phone numbers.

b. It only supports voice recording and in-app voice calls on the smartphone.

BC150B Headphone Cable

* Standard 3.5mm: Fits most of the headphones with 3.5mm sockets, such as headphones from FiiO, Moondrop, some models of HiFiman, Focal Clear MG, Focal Celestee, etc.
* 3.5mm with extended tip: Fits Beyerdynamic, Meze Antonia, TAGO, HarmonicDyne, Focal Clear MG, Focal Celestee, etc.
* Sennheiser 2-pin: Fits Sennheiser HD25, HD580, HD600, HD650, etc.
* Sennheiser 2-pin for recessed socket: Fits Sennheiser HD800 and HD800S, Enigmacoustics Dharma D1000
* Focal Lemo: Fits Focal Utopia, Ultrasone Edition 8EX
* Audio-Technica 2.5mm: Fits ATH-R70X
* Audio-Technica A2DC: Fits ATH-WP900
* Special 3.5mm (4-conductor): Exclusively for HIFIMAN R9, R10 and DEVA Pro

BC150B-MV Headphone Cable

The BC150B-MV is compatible with the Sony MDR-MV1, MDR-M1ST, MDR-1AM20, and the newly released MDR-M1 headphones. When used with the MDR-1AM20, there is no need to use the dedicated protective cover accessory for this headphone cable.
Additionally, the BC150B-MV is specifically designed for Sony headphones, and its 3.5mm headphone plug has a special definition, making it incompatible with headphones of other brands.

BC150B-490 Headphone Cable

The BC150B-490 is only compatible with the Sennheiser HD 490 PRO headphones. While some other over-ear headphones, such as ZMF and Audeze, also feature dual MINI XLR 4Pin connectors, their internal pin definitions differ from those of the HD 490 PRO.
Users of ZMF or Audeze headphones can contact us for a custom-made BC150B headphone cable.

M120B / M130B Headphone Cable

The earphone cable with a metal shell of the MMCX plug is NOT suitable for use when connected to computer devices, especially desktop type. If the audio source device is not well grounded, there may be an uncomfortable feeling of electric shock in the ears。 So for better user experience, this type of earphone cable is recommended for mobile phone users. If you really want to use the M120B/M130B connected to a computer, it is recommended to disconnect the external power supply of the computer and avoid charging while using it.
If you’re experiencing issues where the call audio is not outputting through earphones connected to M120B/M130B cable, you can try the following settings: Go to “Settings -> Sounds & Haptics -> Headphone Safety” on your iPhone. Enable “Reduce Loud Audio,” and then test the call again.
When connecting your earphone units with the 0.78-2Pin specification, please ensure that the pin grooves face outward (most earphones on the market defult to the 0.78-2Pin grooves facing outward). If you cannot distinguish the pin grooves, you can simply use the “R” and “L” silk screen prints to make the connection—just confirm that the “R” and “L” markings on the outer casing of the pins at both ends are facing outward.
Yes, they do.
No, they do not.
The main core of the M120B cable is made of OCC with a small amount of pure silver. The shielding layer is made of high-purity silver plated OFC.
The main core of the M130B is made of high-purity OCC and the shielding layer is made of high-purity OFC.
The M130B does not have a Lightning version.
There are two pin specifications available: MMCX and 0.78-2Pin. And the MMCX pins are compatible with Sennheiser’s IE600/IE900 earphones.

HS110-MagSafe Desktop Stand

Due to the thinner and smaller size of the second-generation original MagSafe charger (Hong Kong version), it is not directly compatible with the HS110-MagSafe desktop stand.

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