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The Koss Utility Series Bluetooth® Adapter brings wireless freedom to your KPH40 Utility, Porta Pro® Utility and KEB90 Utility headphones.
Take calls, control your music, and stay connected on the go with a built-in microphone and onboard controls along with 18+ hour battery life with USB-C charging. A low-profile, integrated metal attach
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I love the utility series. I got the KPH40 to listen to my iPod and Walkman. But now having the option to listen to my iPhone, and also take calls with it is reeeeeally nice. I have not had complaints about the mic. The clip could be better, but even unclipped the dangle is not that bad.
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Anonymous · October 9, 2026
Practical and useful.
It is highly practical and enhances your comfort. It allows for greater freedom of head movement. It eliminates the risk of damaging the phone’s connector or accidentally dropping your device as well.
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Tomasz · October 8, 2026
The microphone on this dissappointed me a bit. Even though I got it at a discount, I would like it to be better for the price. The clip on the back is both convenient and not... it's a bit heavy so if your shirt collar is thin it might pull on it and warp it. It's also at kind of an awkward length, if you wear button downs regular you could clip it between the button-holes just fine, but the wires of the headphones fold upward and might hit your chin or enter your field of vision. Range is alright but not great. I can walk around my room absolutely fine, but if i go downstairs and to a room not directly below mine, they start to cut in and out. Overall though, no noticable difference in sound between this and the cable, I like the convenience, and it's charge is perfectly fine for me.