The Koss BT221i is a wireless version of Koss's long-running clip-on headphones: small on-ear cups on a behind-the-head clip frame, now with Bluetooth, an in-line mic and remote, and USB-C charging. Koss rates the battery at 18+ hours, which is generous for a headphone this size and beats most clip-on rivals that run 8 to 12 hours. The clip design keeps the ears open to traffic and conversation, so it suits runners, cyclists and office users who want background sound rather than isolation. Against sealed on-ear and earbud rivals it gives up bass depth and noise blocking, and there is no active noise cancellation or app EQ.
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Ratings are high, with buyers generally pleased with the fit, battery life and the convenience of the clip design. The recurring complaint is the open sound: little bass and no blocking of background noise.
The Koss BT221i is a pair of wireless on-ear clip headphones that connect over Bluetooth. They have a rechargeable battery that charges through USB-C and lasts 18+ hours.
An in-line microphone and remote let you take calls and control music. The remote handles play/pause, start/stop, volume, and answering or ending a call.
