Наушники — Koss BT232i Bluetooth

The BT232i is a Bluetooth sports earphone in the Koss range, from the brand that has made headphones in Milwaukee since 1953. It combines in-ear drivers with Koss's SportClip ear-hook system, which loops over the ear to hold the earpiece in place, and it is designed for running, training and other active use where ordinary earbuds tend to slip out. Its two earpieces are connected by a short cable carrying the controls and battery.

Key specs that matter

The BT232i uses dynamic drivers in a closed in-ear design. Frequency response is 18Hz to 20kHz and sensitivity is 104dB/mW. It connects by Bluetooth 4.2, and a built-in rechargeable lithium-ion battery gives about six hours of playback, recharging in around one hour. An in-line microphone and buttons handle calls, track changes and volume. Replaceable ear tips are supplied, and the headphones weigh around 50g. The package measures about 156 x 65 x 27mm.

Engineering and use context

The SportClip is a flexible hook behind each ear that carries the earpiece's weight and keeps it anchored, instead of relying on the ear canal alone to hold it. During running, repeated impacts tend to loosen an in-ear seal; supporting the earpiece from the ear itself keeps the tip seated, which preserves both the bass response and isolation that a sealed in-ear design depends on. The dynamic driver, a miniature cone and voice coil, reproduces the full range from a single unit, and its sensitivity lets it reach useful levels from the small amplifier in the headset. Placing the battery and Bluetooth electronics in the cable rather than in each earpiece keeps the earpieces light, which matters when they must stay in place during exercise, and means there is no separate charging case to carry. The quick recharge suits short breaks between sessions. The in-line control module places volume, track and call functions within reach while running or cycling, without handling the phone. Interchangeable tips let the user choose the size that seals best, which is the main factor in bass extension and noise isolation for any in-ear headphone.

Pairing

The BT232i pairs with phones, tablets and sports watches with Bluetooth audio. Its secure ear-hook fit suits gym sessions, running and cycling, where a cable-free earbud might fall out, and the sealed design limits the need for high volume in noisy environments.

Alternatives

Koss's own BT115i offers the same Bluetooth platform in a conventional in-ear format without ear hooks.