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Hearing is Believing
BT221i Wireless Ear Clips delivers high-fidelity audio in a lightweight wireless ear clip design.
Legendary Sound
Experience remarkable high-fidelity audio with deep bass and a superior midrange.
No Headphone Jack? No Problem.
BT221i Wireless Ear Clips feature Bluetooth 4.2 for wireless connectivity.
The Perfect Fit
BT221i Wireless Ear Clips feature a unique ear-clip design that delivers a comfortable, secure fit.
Stay Connected
Adjust Volume, Pause/Play/Skip tracks and Answer/End calls with in-line microphone and remote.
Ear Clip Design
Designed for on-the-go listening, BT221i Wireless Ear Clips features a lightweight, ear clip design perfect for active individuals.
In-Line Controls
A convenient in-line microphone and remote allows listeners to adjust Volume, Pause/Play/Skip tracks as well as Answer/End calls.
Cable Management
BT221i Wireless Ear Clips features a convenient cable management clip that can be slid along the length of the cable for a secure and tangle free fit.
Battery Life
Get up to 6+ hours of play/talk time with BT221i Wireless Ear Clips.
Legendary Sound. No Strings Attached.
High-Fidelity Audio
At the heart of the BT221i Wireless Ear Clips lies a dynamic element that delivers high-fidelity audio with remarkable clarity and precision. Music comes to life with vibrant details, ensuring that every note is heard with astonishing accuracy.
Bluetooth 4.2
BT221i Wireless Ear Clips take everything listeners have come to love about the original and adds Wireless Bluetooth 4.2 along with an in-line microphone and remote for adjusting volume, taking calls and controlling music.
Hearing is Believing
BT221i Wireless Ear Clips
The Koss BT221i Wireless Bluetooth Ear Clips are a bridge between the past and the present, combining classic design elements with modern audio excellence. They offer a comfortable and immersive listening experience that brings music to life with astonishing clarity and fidelity.
More Products From Koss
 BT221i |  Porta Pro Wireless |  Porta Pro |  Porta Pro Limited Edition |  Porta Pro Utility |  KPH40 Utility |  KSC75 | |
|---|---|---|---|---|---|---|---|
Customer Reviews | — | — | — | — | — | — | — |
Price | — | — | — | — | — | — | — |
Headphone Type | Ear Clip | On Ear | On Ear | On Ear | On Ear | On Ear | Ear Clip |
Connection | Bluetooth | Bluetooth | 3.5mm | 3.5mm | Utility Series | Utility Series | 3.5mm |
Utility Series | — | — | — | — | 3.5mm, USB-C & Lightning | 3.5mm, USB-C & Lightning | — |
Audio Controls | In-Line Remote | Integrated Audio Controls | — | In-Line Remote | Utility Cord Remote | Utility Cord Remote | — |
Microphone | In-Line Remote | Integrated Microphone | — | In-Line Remote | Utility Cord Remote | Utility Cord Remote | — |
Noise Cancelling | — | — | — | — | — | — | — |
Adjustable Headband | — | Yes | Yes | Yes | Yes | Yes | — |
Collapsible | — | Yes | Yes | Yes | Yes | — | — |
Carrying Case/Pouch | — | Hard Shell Case | Carrying Pouch | Hardshell Case | Carrying Pouch | — | — |
In 1958 John C. Koss changed the way we all listen to music when he invented the world's first SP/3 stereophone.
Koss sought to replicate the excitement of a live musical performance, allowing listeners to experience sound as they had never before, bringing them closer to the music they love. Music lovers around the world recognize that dedication to accuracy in sound reproduction as: The Sound of Koss
Best Sellers
Porta Pro Collection
Retro Style Collection
Utility Series
Standard & Oversized Cushions
Birth of the Stereophone
Before the world's first SP/3 Stereophone in 1958, John C. Koss developed a portable stereo photograph player with side-wing speakers.
World's First SP/3 Stereophone
in 1958 John C. Koss invented the world's first SP/3 Stereophone introducing personal stereo audio to the world.
SP/3X
In 1960 Koss released the predecessor to the SP/3 with a lighter design, more comfortable headband and superior sound quality.
Pro/4AA
In 1970 Pro/4AA set the standard for full-size professional headphones delivering true full frequency performance.
Koss World Headquarters
On June 25, 1971 John C. Koss unveiled the new Koss World Headquarters in Milwaukee, Wisconsin.
HV/1A
In 1974, Koss released the HV/1A the first dynamic headphone capable of reproducing all 10 audible octaves.
Porta Pro
In 1984 the acclaimed Porta Pro was released and set performance and comfort standards worldwide for decades to come.
JCK/300 Kordless System
In 1989 the JCK/300 Kordless Headphone system set the standard for infrared wireless headphones.
ESP/950
In 1990 Koss's revolutionary ESP/950 electrostatic headphones introduced breakthrough high-fidelity sound.
Pro4S Studio
Carrying on the legacy of the Pro/4 line, 2014's Pro4S Studio Headphone was specifically designed for audio professionals.
KPH30i
In 2017 Koss released the acclaimed KPH30i featuring an ultra-light weight design with remarkable high-fidelity sound.
Porta Pro Wireless
In 2024 Porta Pro Wireless packed innovative technologies that deliver the same legendary fit, aesthetic and sound as the original.
A/550
Introduced in 2026, A/550 represents the pinnacle of acoustic engineering and design delivering unparalleled performance and comfort.
Hearing is Believing
BT221i Wireless Ear Clips delivers high-fidelity audio in a lightweight wireless ear clip design.
Legendary Sound
Experience remarkable high-fidelity audio with deep bass and a superior midrange.
No Headphone Jack? No Problem.
BT221i Wireless Ear Clips feature Bluetooth 4.2 for wireless connectivity.
The Perfect Fit
BT221i Wireless Ear Clips feature a unique ear-clip design that delivers a comfortable, secure fit.
Stay Connected
Adjust Volume, Pause/Play/Skip tracks and Answer/End calls with in-line microphone and remote.
Ear Clip Design
Designed for on-the-go listening, BT221i Wireless Ear Clips features a lightweight, ear clip design perfect for active individuals.
In-Line Controls
A convenient in-line microphone and remote allows listeners to adjust Volume, Pause/Play/Skip tracks as well as Answer/End calls.
Cable Management
BT221i Wireless Ear Clips features a convenient cable management clip that can be slid along the length of the cable for a secure and tangle free fit.
Battery Life
Get up to 6+ hours of play/talk time with BT221i Wireless Ear Clips.
Legendary Sound. No Strings Attached.
High-Fidelity Audio
At the heart of the BT221i Wireless Ear Clips lies a dynamic element that delivers high-fidelity audio with remarkable clarity and precision. Music comes to life with vibrant details, ensuring that every note is heard with astonishing accuracy.
Bluetooth 4.2
BT221i Wireless Ear Clips take everything listeners have come to love about the original and adds Wireless Bluetooth 4.2 along with an in-line microphone and remote for adjusting volume, taking calls and controlling music.
Hearing is Believing
BT221i Wireless Ear Clips
The Koss BT221i Wireless Bluetooth Ear Clips are a bridge between the past and the present, combining classic design elements with modern audio excellence. They offer a comfortable and immersive listening experience that brings music to life with astonishing clarity and fidelity.
In-Line Controls
A convenient in-line microphone and remote allows listeners to adjust Volume, Pause/Play/Skip tracks as well as Answer/End calls.
Ear Clip Design
Pivoting ear clips design allows for a comfortable, secure fit.
Foam Cushions
Soft foam cushions provide a comfortable listening experience for hours of use.
Microphone
Integrated in-line microphone for taking calls.
| Bluetooth | 4.2 |
|---|---|
| Controls | In-line remote for adjusting volume and controlling music. |
| Microphone | Integrated in-line microphone for taking calls. |
| Battery Life | 6+ hours of play/talk time |
| Cushions | Foam |
| Design | Pivoting ear clip design |
| Frequency Response | 50-18,000 Hz |
| Included | BT221i Wireless Ear Clips and USB charging cable |
More Products From Koss
BT221i | Porta Pro Wireless | Porta Pro | Porta Pro Limited Edition |  Porta Pro Utility | KPH40 Utility | KSC75 |
|---|---|---|---|---|---|---|
| Customer Reviews | ||||||
| — | — | — | — | — | — | — |
| Price | ||||||
| — | — | — | — | — | — | — |
| Headphone Type | ||||||
| Ear Clip | On Ear | On Ear | On Ear | On Ear | On Ear | Ear Clip |
| Connection | ||||||
| Bluetooth | Bluetooth | 3.5mm | 3.5mm | Utility Series | Utility Series | 3.5mm |
| Utility Series | ||||||
| — | — | — | — | 3.5mm, USB-C & Lightning | 3.5mm, USB-C & Lightning | — |
| Audio Controls | ||||||
| In-Line Remote | Integrated Audio Controls | — | In-Line Remote | Utility Cord Remote | Utility Cord Remote | — |
| Microphone | ||||||
| In-Line Remote | Integrated Microphone | — | In-Line Remote | Utility Cord Remote | Utility Cord Remote | — |
| Noise Cancelling | ||||||
| — | — | — | — | — | — | — |
| Adjustable Headband | ||||||
| — | Yes | Yes | Yes | Yes | Yes | — |
| Collapsible | ||||||
| — | Yes | Yes | Yes | Yes | — | — |
| Carrying Case/Pouch | ||||||
| — | Hard Shell Case | Carrying Pouch | Hardshell Case | Carrying Pouch | — | — |
In 1958 John C. Koss changed the way we all listen to music when he invented the world's first SP/3 stereophone.
Koss sought to replicate the excitement of a live musical performance, allowing listeners to experience sound as they had never before, bringing them closer to the music they love. Music lovers around the world recognize that dedication to accuracy in sound reproduction as: The Sound of Koss
Best Sellers
Porta Pro Collection
Retro Style Collection
Utility Series
Standard & Oversized Cushions
Birth of the Stereophone
Before the world's first SP/3 Stereophone in 1958, John C. Koss developed a portable stereo photograph player with side-wing speakers.
World's First SP/3 Stereophone
in 1958 John C. Koss invented the world's first SP/3 Stereophone introducing personal stereo audio to the world.
SP/3X
In 1960 Koss released the predecessor to the SP/3 with a lighter design, more comfortable headband and superior sound quality.
Pro/4AA
In 1970 Pro/4AA set the standard for full-size professional headphones delivering true full frequency performance.
Koss World Headquarters
On June 25, 1971 John C. Koss unveiled the new Koss World Headquarters in Milwaukee, Wisconsin.
HV/1A
In 1974, Koss released the HV/1A the first dynamic headphone capable of reproducing all 10 audible octaves.
Porta Pro
In 1984 the acclaimed Porta Pro was released and set performance and comfort standards worldwide for decades to come.
JCK/300 Kordless System
In 1989 the JCK/300 Kordless Headphone system set the standard for infrared wireless headphones.
ESP/950
In 1990 Koss's revolutionary ESP/950 electrostatic headphones introduced breakthrough high-fidelity sound.
Pro4S Studio
Carrying on the legacy of the Pro/4 line, 2014's Pro4S Studio Headphone was specifically designed for audio professionals.
KPH30i
In 2017 Koss released the acclaimed KPH30i featuring an ultra-light weight design with remarkable high-fidelity sound.
Porta Pro Wireless
In 2024 Porta Pro Wireless packed innovative technologies that deliver the same legendary fit, aesthetic and sound as the original.
A/550
Introduced in 2026, A/550 represents the pinnacle of acoustic engineering and design delivering unparalleled performance and comfort.
