Наушники — Koss KSC35 Wireless

The KSC35 Wireless is the Bluetooth version of the Koss KSC35 ear clip headphone, keeping the clip-on format of the wired model while replacing the cable to the source with a wireless link. Koss lists it at USD 49.99, a small step above the USD 44.99 wired KSC35. A protective carrying case is included, and the warranty is a 1-year limited cover, shorter than the lifetime cover on the wired KSC35.

Key specs that matter

The stated response spans 15 Hz to 25,000 Hz and sensitivity is 101 dB SPL per milliwatt, figures that match the wired KSC35. The wireless link uses Bluetooth version 5.2, while the wired KSC21, KSC22i, KSC35 and KSC75 in the same family all rely on a cable to the source. The built-in battery is rechargeable through a USB-C port, and Koss quotes a battery life of 18 hours or more. No impedance, distortion, driver size or weight figure is published for this version.

Engineering and use context

As with the wired model, the drivers are dynamic elements chosen to reach a wide frequency response. Each earpiece has a pivoting ear plate with a soft foam cushion, so the clip and housing can follow the shape of the ear. A short cable still links the two earpieces, and an in-line mic with remote sits on it. The remote handles play and pause, start and stop, volume and answering or ending calls, so the source does not need to be taken out of a pocket or bag for these functions. A cable management clip is supplied to keep that connecting lead in order while the headphone is worn. Koss presents the model as a portable, clip-on design suited to active use, and it lists the long battery life among the main features of the model.

Pairing

Sources are phones, tablets, laptops and players with Bluetooth, and Koss notes that the in-line controls let the wearer manage calls and music hands-free from a paired phone. Power comes in through the USB-C port on the headphone, the only charging connection Koss specifies for the rechargeable cell inside. The included case protects the headphone and the cable management clip when it is not being worn. Listeners who prefer a wired connection with a published 60 ohm rating and below 0.2 percent distortion can choose the standard KSC35 instead, which also comes with the lifetime warranty and a 1.2 m cable ending in a 3.5 mm plug.

Alternatives

For a wired option in the same clip-on range Koss offers the KSC75, with titanium coated diaphragms.