Manual of product BT221i
Editorial note
The Koss BT221i is an in-ear headphone that offers an immersive listening experience thanks to its wide frequency range of 50 to 18,000 Hz and a sensitivity of 101 dB, ensuring clear and powerful sound. Its design is also made for comfort, making it ideal for prolonged use, especially during sports activities. Additionally, the three programmable buttons allow for simplified control management, making the use of the device enjoyable. However, some limitations deserve to be highlighted. The continuous audio playback time of 6 hours may be insufficient for users who wish to listen to music or watch movies for long sessions. The Bluetooth 4.2 connectivity, while convenient, has a limited range, which can lead to interruptions if the user moves too far from the source device. Furthermore, the absence of 3.5 mm and USB connectors may frustrate those seeking more connection flexibility. Finally, although the built-in rechargeable battery ensures prolonged use, its nickel-metal hybrid (NiMH) technology may not offer the same longevity as other types of batteries, which could lead to a faster degradation of charge capacity over time. Despite these drawbacks, the Koss BT221i remains an interesting choice for music lovers looking for a comfortable and practical headphone.Score details
User experience
The user experience is generally positive thanks to the in-ear design, offering optimal comfort, and the three programmable buttons that facilitate command management.
Performance
The sound performance is satisfactory with a wide frequency range of 50 to 18,000 Hz, but the playback time of 6 hours may be insufficient for some users.
Battery life
The built-in rechargeable battery offers a 6-hour autonomy, which is acceptable but may not suit users with extended listening sessions.
connectivity
The Bluetooth 4.2 connectivity is convenient, but its limited range can cause interruptions if the user moves too far from the source device. Additionally, the lack of 3.5 mm and USB connectors limits connection options.
Features
The features, including wireless connectivity and programmable buttons, add considerable value, but the NiMH battery technology may not offer the durability of other options.
Advantages
Frequency range of 50 to 18,000 Hz
6 hours of battery life
Wireless Bluetooth 4.2 connectivity
In-ear design for comfort
Three programmable buttons for customization
Disadvantages
Limited Bluetooth range, possible interruptions
No 3.5 mm or USB connector
6-hour battery life insufficient
NiMH battery less durable than lithium-ion
Sensitivity of 101 dB, possible hearing fatigue
Technical Specifications BT221i
General Information
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ModelBT221I
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Brand
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Category
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Type
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SKU1864906
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MPN1864906
Headphones/Earphones
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Headphone frequency50 - 18000 Hz
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Headset sensitivity101 dB
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Ear couplingSupra-aural
Battery
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Battery typeBuilt-in battery
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Battery technologyLithium-Ion (Li-Ion)
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Rechargeable batteryYes
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Streaming audio playback6 h
Connectivity
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Bluetooth model4.2
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Connectivity technologyWireless
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BluetoothYes
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USB ConnectivityNo
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USB ConnectivityNo
Representation / realization
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Volume orderButtons
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Product typeHeadset
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Product colorBlack, Blue
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Type of headsetBinaural
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Portable headset styleEar hooks
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Recommended useSports
Other features
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Quantity of programmable buttons3
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Cord/cable clipYes
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2.5 mm connectorNo
Frequently Asked Questions
Is the Koss BT221i manual available in French?
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Presentation of product BT221i specifications from brand Koss
General Information
The Koss BT221i is a product from the Koss brand, known for its commitment to sound quality and technological innovation. This model, identified by the number BT221i | 194332, is designed to deliver optimal audio performance, thus ensuring an enhanced listening experience. Its EAN code, 0021299194331, allows for precise identification within distribution systems.
Headphones/Earphones
The Koss BT221i earphones feature a frequency range of 50 to 18,000 Hz, allowing for extended sound reproduction for total immersion in music. With a sensitivity of 101 dB, they deliver clear and powerful sound, perfect for music lovers. Their in-ear design not only ensures prolonged comfort but also provides acoustic isolation that promotes distraction-free listening.
Battery
The Koss BT221i is equipped with a built-in hybrid nickel-metal (NiMH) battery, offering a continuous playback time of 6 hours. This rechargeable battery is both practical and economical, allowing for extended use without interruption. Although it provides satisfactory performance, it is worth noting that it may exhibit capacity degradation over the long term compared to lithium-ion technologies.
Connectivity
This model uses Bluetooth 4.2 technology, ensuring a fast and efficient wireless connection with compatible devices. This wireless feature allows for freedom of movement without the hassle of cables. However, it is important to mention the absence of 3.5 mm and USB connectors, which may limit connection options for some users.
Representation / Realization
The Koss BT221i features a digital volume control interface, making it easy to manage sound settings. Its binaural design and Black and Blue colors give it a modern and stylish appearance. Recommended for use during sports activities or on PC, it offers an immersive audio experience suited to various listening needs.
Other Features
With three programmable buttons, the Koss BT221i allows for advanced customization of controls for simplified use. Additionally, it is equipped with a cord clip, ensuring that the cables stay in place and avoid tangling. However, it does not have a 2.5 mm connector, which may limit its compatibility with certain devices.
