Audio T Verdict
The Sony IER-EX15C provide a simple wired headphone option for modern phones, tablets, computers and compatible gaming devices that use USB-C rather than a conventional headphone socket. There is no battery to charge, no Bluetooth pairing process and no wireless connection to manage.
The compact housings contain 5mm drivers with high-compliance diaphragms, designed to combine powerful bass with clear vocals. Three supplied ear-tip sizes help achieve a secure fit, while the serrated 1.2m cable and cable adjuster make them easier to carry and manage.
An inline remote adds volume controls, music and call operation, microphone muting and access to a compatible voice assistant. For music, meetings and calls across compatible USB-C devices, the IER-EX15C are a straightforward and highly portable solution.
Check USB-C Audio Compatibility
The IER-EX15C require a USB-C device that supports USB Audio Class 1.0. A USB-C socket does not automatically guarantee audio compatibility, and control functions can vary according to the connected device, operating system and application.
Sony IER-EX15C USB-C Wired In-Ear Headphones
The Sony IER-EX15C are compact wired in-ear headphones designed for compatible USB-C phones, tablets, laptops, computers and gaming devices.
They connect directly through USB-C without requiring Bluetooth pairing, a rechargeable headphone battery or a separate analogue headphone adaptor.
The 5mm drivers are housed inside lightweight contoured earpieces, while an inline remote provides convenient access to playback, volume, call and microphone controls.
- USB-C wired in-ear headphones
- Compatible with USB Audio Class 1.0 devices
- Closed acoustic design
- 5mm dynamic drivers
- High-compliance diaphragms
- High-power neodymium magnets
- Compact contoured housings
- Approximately 3g specified weight
- XS, M and XL silicone ear tips
- Secure in-ear fit
- 1.2m Y-type cable
- Serrated cable surface
- Cable slider and adjuster
- Inline remote control
- Multi-function button
- Volume up and down controls
- Play and pause control
- Track selection
- Call controls
- Built-in microphone
- Omnidirectional microphone
- Microphone mute and unmute
- Voice-assistant access
- No battery or charging required
- No Bluetooth pairing required
- Black, White, Blue and Pink finishes
- Plastic-free individual packaging
USB-C Connection
The IER-EX15C connect directly to a compatible USB-C port.
This makes them particularly relevant as more smartphones, tablets and portable computers are produced without a conventional analogue headphone socket.
The headphones are designed for equipment supporting USB Audio Class 1.0. Compatible products can include:
- USB-C smartphones
- USB-C tablets
- Laptops and desktop computers
- Portable gaming devices
- Other compatible USB Audio Class 1.0 sources
Compatibility and control operation depend on the connected product, its operating system and the application being used.
USB Audio Class 1.0 Compatibility
USB Audio Class 1.0 is a standard used by compatible digital audio products to communicate over USB without requiring a dedicated manufacturer driver in many common situations.
The connected device must support audio output through its USB-C port. Some USB-C smartphones may also require USB audio, USB On-The-Go or connected-device detection to be enabled within their settings.
A USB-C Socket Is Not Enough on Its Own
USB-C describes the physical connector, but devices can support different functions through that socket. Check that the phone, tablet, computer or console supports USB Audio Class 1.0 before ordering.
Plug In and Start Listening
The wired USB-C connection avoids the Bluetooth pairing process required by wireless headphones.
There is no headphone battery to monitor or recharge. Once connected to a compatible device, the IER-EX15C can be used for music, meetings, gaming and calls.
A wired digital connection also avoids wireless dropouts and Bluetooth transmission delays caused by the headphone connection itself.
5mm Dynamic Drivers
Each earpiece contains a compact 5mm driver with a high-compliance diaphragm and high-power neodymium magnet.
Sony has designed the driver system to keep the earpieces small and lightweight while producing powerful bass and clear vocals.
The final sound will also depend on ear-tip fit, listening volume, recording quality, the connected device and any sound processing applied by the source.
Closed In-Ear Design
The IER-EX15C use a closed inner-ear construction.
The silicone ear tips sit within the entrance of the ear canal, helping create an acoustic seal and hold the earpieces securely in place.
A suitable seal is important because it can affect:
- Bass response
- Sound balance
- Passive isolation
- Comfort
- Stability during movement
Three Ear-Tip Sizes
Sony supplies hybrid silicone rubber ear tips in XS, M and XL sizes.
The most suitable size should provide a secure seal without creating uncomfortable pressure. A loose fit can reduce bass and allow the earpieces to move, while an excessively tight fit can become uncomfortable.
Check Both Ears Independently
It is normal to need a different ear-tip size in each ear. Choose the combination that provides the most secure and comfortable fit rather than assuming both sides must use the same size.
Compact Contoured Housings
The earpiece housings have been shaped to follow the contours of the ears while remaining small and lightweight.
The compact design helps reduce the amount of material sitting outside the ear and makes the earphones easier to carry in a pocket or bag.
Sony specifies an approximate weight of 3g.
Inline Remote Control
The inline remote places frequently used controls within easy reach on the cable.
Depending on the connected device, operating system and application, the remote can provide:
- Volume increase
- Volume decrease
- Play and pause
- Track selection
- Answering calls
- Ending calls
- Microphone mute and unmute
- Voice-assistant access
If a particular function is not supported through the remote, it can normally be operated from the connected device instead.
Multi-Function Button
The central multi-function button changes operation according to the number and timing of button presses and the application being used.
Supported functions can include playing or pausing music, changing tracks, answering calls, ending calls, accessing a voice assistant and controlling the microphone.
Exact operation can differ between devices and applications, so the connected product and Sony operating instructions should be checked where necessary.
Volume Controls
Dedicated volume up and down buttons allow compatible device volume to be adjusted without taking the phone, tablet or computer from a pocket or bag.
Volume operation depends on the connected device and software. If the remote buttons do not control a particular application, use the device's own controls.
Protect Your Hearing
Listening at excessive volume can damage hearing. Reduce the source volume before inserting the earphones and increase it only as far as required for comfortable listening.
Built-In Omnidirectional Microphone
The inline remote contains a built-in omnidirectional microphone for compatible calls, online meetings and voice communication.
An omnidirectional microphone can pick up sound from around the microphone housing rather than relying on extremely precise positioning.
Call clarity will still depend on microphone position, surrounding noise, the connected device, network quality and the application being used.
Microphone Mute Control
The inline remote can mute and unmute the microphone during compatible calls and meetings.
This is useful when you need to prevent background conversation or room noise being transmitted without ending the call.
Mute operation can vary between devices, operating systems and applications.
Voice-Assistant Access
The multi-function button can provide access to a compatible voice assistant on the connected device.
Available functions depend on the device and assistant but may include music playback, calls, messages, reminders, questions and directions.
1.2m Y-Type Cable
The IER-EX15C use a fixed Y-type cable measuring approximately 1.2m.
The cable separates into left and right sections leading to the individual earpieces. Its length is intended for personal listening where the connected device is kept relatively close to the listener.
The fixed cable cannot be detached or replaced independently.
Serrated Cable Surface
Sony uses a textured serrated finish along the cable to help resist knots and reduce tangling during everyday carrying and storage.
No cable can be completely tangle-free, but the textured surface is intended to make the IER-EX15C easier to retrieve from a pocket or bag.
Cable Slider and Adjuster
A built-in slider and supplied cable adjuster help manage the cable during use and storage.
The slider can reduce loose cable movement beneath the chin, while the adjuster helps keep the cable gathered when the earphones are packed away.
Avoid Tight Cable Wrapping
Store the cable in a loose loop rather than wrapping it tightly around a phone or the earpieces. Repeated sharp bends can place unnecessary strain on the internal conductors and USB-C connector.
No Battery or Charging Required
The IER-EX15C draw the power required for operation through the compatible USB-C connection.
There is no rechargeable headphone battery, charging case or separate charging routine.
This makes them useful as a main pair of everyday earphones or as a backup when wireless headphones need charging.
No Bluetooth Pairing
The wired connection means there is no Bluetooth menu, wireless codec or pairing process to manage.
The earphones do not connect wirelessly and cannot be used when physically disconnected from the source.
Not Water Resistant
Sony does not give the IER-EX15C a water-resistance rating.
They should therefore be kept away from rain, splashes, excessive sweat and other moisture.
Keep the Earphones and USB-C Connector Dry
The IER-EX15C are not waterproof or water resistant. Do not use them for swimming, expose them to heavy rain or connect the USB-C plug while it or the source socket is wet.
Black, White, Blue and Pink Finishes
The IER-EX15C are available in Black, White, Blue and Pink finishes.
Technical performance remains the same across the different colour options.
Plastic-Free Individual Packaging
Sony states that no plastic is included in the IER-EX15C's individual packaging, excluding coating and adhesive materials where applicable.
USB-C Wired or Bluetooth Earphones?
Sony IER-EX15C
- Direct USB-C wired connection
- No battery or charging required
- No Bluetooth pairing
- Inline microphone and controls
- Both earpieces remain physically connected
Bluetooth Earphones
- Wireless connection to the source
- Require a charged battery
- Require Bluetooth pairing
- Control features vary by model
- May use a neckband or true wireless design
Who Are the Sony IER-EX15C For?
The IER-EX15C are particularly well suited to listeners looking for:
- Wired earphones for a compatible USB-C device
- Earphones that do not require charging
- An alternative to Bluetooth
- Compact earphones for music and calls
- Inline volume and playback controls
- A built-in microphone
- Microphone mute control
- Earphones for online meetings
- A lightweight portable design
- Different ear-tip sizes
- A tangle-resistant cable design
- A choice of four colours
Who Might Need a Different Model?
The IER-EX15C may not be suitable if your device lacks USB Audio Class 1.0 support, uses only a conventional analogue headphone socket or requires a different connector such as Lightning.
They are also not the right choice if you need wireless listening, active noise cancellation or water resistance for exercise and outdoor use.
Key Features
- USB-C wired connection
- USB Audio Class 1.0 compatibility
- Closed in-ear design
- 5mm dynamic drivers
- High-compliance diaphragms
- High-power neodymium magnets
- Compact contoured housings
- Approximately 3g weight
- XS ear tips
- Medium ear tips
- XL ear tips
- 1.2m fixed cable
- Y-type cable arrangement
- Serrated cable surface
- Cable slider
- Cable adjuster included
- Inline remote control
- Multi-function button
- Volume up and down
- Music playback control
- Track selection
- Call controls
- Omnidirectional microphone
- Microphone mute control
- Voice-assistant access
- No battery required
- No Bluetooth pairing
- Black, White, Blue and Pink finishes
- Plastic-free individual packaging
Frequently Asked Questions
What are the Sony IER-EX15C?
The Sony IER-EX15C are compact wired in-ear headphones that connect directly to compatible USB-C audio devices.
Which connection do the IER-EX15C use?
They use a USB-C connector and require a device supporting USB Audio Class 1.0.
Will the IER-EX15C work with every USB-C device?
No. The connected product must support USB Audio Class 1.0. Functions can also vary according to the device, operating system and application.
Can the IER-EX15C connect to an Android phone?
They can connect to compatible USB-C Android phones supporting USB Audio Class 1.0. Some phones may require USB audio, device detection or USB On-The-Go settings to be enabled.
Can the IER-EX15C connect to an iPhone?
They can connect directly to compatible USB-C iPhone models that support USB audio. They cannot connect directly to older iPhones fitted only with a Lightning socket.
Can the IER-EX15C connect to a laptop or computer?
Yes, provided the computer has a compatible USB-C port supporting USB Audio Class 1.0.
Can the IER-EX15C be used with a gaming device?
They can be used with compatible gaming devices that support USB Audio Class 1.0 through their USB-C connection. Control and microphone operation may vary.
Can the IER-EX15C connect to a conventional headphone socket?
No. They use USB-C and cannot connect directly to a conventional analogue stereo mini headphone socket.
Do the Sony IER-EX15C need charging?
No. They are powered through the compatible USB-C connection and contain no rechargeable headphone battery.
Do the IER-EX15C use Bluetooth?
No. They are wired headphones and do not require Bluetooth pairing.
What size drivers do the IER-EX15C use?
Each earpiece contains a compact 5mm driver with a high-compliance diaphragm and high-power neodymium magnet.
Which ear-tip sizes are supplied?
Sony supplies hybrid silicone rubber ear tips in XS, M and XL sizes.
Do the IER-EX15C have a microphone?
Yes. The inline remote contains a built-in omnidirectional microphone for compatible calls, meetings and voice communication.
Can the microphone be muted?
Yes. The inline remote can mute and unmute the microphone with compatible devices and applications.
Can the IER-EX15C control volume?
Yes. The inline remote includes dedicated volume up and down controls, although operation can vary between devices and applications.
Can the IER-EX15C control music playback?
Yes. The multi-function button can play or pause music and change tracks on compatible devices and applications.
Can the IER-EX15C answer telephone calls?
Yes. The inline remote and microphone support call answering and ending on compatible phones and communication applications.
Do the IER-EX15C support voice assistants?
Yes. The multi-function button can provide access to a compatible voice assistant on the connected device.
How long is the IER-EX15C cable?
The fixed Y-type cable measures approximately 1.2m.
What is the serrated cable for?
The textured serrated cable surface is designed to resist knots and reduce tangling during everyday carrying and storage.
Is a cable adjuster included?
Yes. Sony includes a cable adjuster, while the cable also incorporates a slider to help manage loose cable.
Are the Sony IER-EX15C waterproof?
No. Sony does not give the IER-EX15C a water-resistance rating. They should be protected from rain, splashes, excessive sweat and submersion.
How much do the IER-EX15C weigh?
Sony specifies an approximate weight of 3g.
Which colours are available?
The Sony IER-EX15C are available in Black, White, Blue and Pink finishes.
What is included with the IER-EX15C?
Sony lists hybrid silicone rubber ear tips, a cable adjuster, operating instructions and a warranty card as included items.
Related Sony Products and Audio T Pages
Why Buy the Sony IER-EX15C From Audio T?
Choosing USB-C earphones involves more than checking the shape of the connector. The source must support USB Audio Class 1.0, while remote and microphone functions can vary between devices, operating systems and applications.
Audio T can help check compatibility, explain the differences between USB-C, conventional analogue and Bluetooth headphones, and help you choose the most suitable option for your phone, tablet, computer or other device.
- Friendly and straightforward headphone advice
- USB-C audio compatibility checks
- USB Audio Class 1.0 guidance
- Phone and tablet connection advice
- Laptop and computer compatibility checks
- Gaming-device connection guidance
- Wired and wireless headphone comparisons
- Earbud fit and ear-tip guidance
- Inline remote assistance
- Microphone and call setup
- Cable-management advice
- Ongoing setup and after-sales support
Contact your local Audio T store if you would like help checking whether the Sony IER-EX15C are compatible with your USB-C device.