Koss BT221i
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Koss BT221i
Type:on-ear
Connection:Bluetooth v4.2
Frequencies:50 – 18000 Hz
Sensitivity:101 dB
Battery:up to 6 h
Swivel ear hooks.
All specifications
Specifications BT221i
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The information in the model description is for reference purposes.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog Koss 2026 - new arrivals, bestsellers, and the most relevant models Koss.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog Koss 2026 - new arrivals, bestsellers, and the most relevant models Koss.
Everything You Need to Know About Headphones: A Complete Technical GuideThe choice begins with understanding the design and features.
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Construction. I don't like earbuds, and there are very few over-ear headphones with behind-the-ear mounts. As for the sound, I must say - it's decent sound. Very flimsy. Fell apart in less than a year. The battery is a bit weak.  Anton Alyabev: use Koss BT221i few months |
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We recommendCompare using chart →
for active sports, overhead, open, wireless, Bluetooth v5.3, bone conduction, voice assistant, waterproof, battery: 150 mAh, up to 10 h
office, one earphone, overhead, open, wireless, radio channel, 150 – 6800 Hz, 32 Ohm, battery: up to 9 h
in-ear, wireless, true wireless, Bluetooth v5.3, AAC, LDAC, active noise cancellation, voice assistant, waterproof, 20 – 40000 Hz, battery: up to 8 h, with case + only LDAC
студийные, overhead, open, wired, 3.5 mm, 6.35 mm, 3 m, no microphone, 5 – 35000 Hz, 250 Ohm, 100 mW
gaming, PlayStation 5, Switch, overhead, closed, wireless, Bluetooth v5.3, AAC, radio channel, 3D sound, 20 – 20000 Hz, 64 Ohm, battery: up to 200 h
overhead, closed, combined, detachable cable, USB-C, 1.2 m, Bluetooth v6.0, active noise cancellation, 3D sound, voice assistant, foldable, 10 – 40000 Hz, 32 Ohm, battery: 870 mAh, up to 50 h
overhead, closed, combined, detachable cable, 3.5 mm, 1.2 m, Bluetooth v5.0, AAC, game mode, 5 – 32000 Hz, 36 Ohm, L-plug, battery: up to 60 h
overhead, closed, combined, detachable cable, 3.5 mm, Bluetooth v5.3, active noise cancellation, foldable, 20 – 20000 Hz, 32 Ohm, 45 degree angle plug, battery: 690 mAh, up to 44 h
студийные, overhead, closed, wired, detachable cable, 3.5 mm, 6.35 mm, 3 m, no microphone, foldable, 15 – 28000 Hz, 38 Ohm, 1600 mW, battery: with case + maximum
in-ear, wireless, true wireless, Bluetooth v5.3, AAC, active noise cancellation, 3D sound, voice assistant, waterproof, 20 – 20000 Hz, battery: up to 8.5 h