Koss KSC21k wired in-ear headphones black

The Koss KSC21k are wired in-ear headphones built for everyday listening. With a 3.5 mm jack connection and a frequency range of 50–18,000 Hz, these compact earphones deliver clear audio across music, podcasts, and calls without the complexity of wireless connectivity.

Reliable wired audio in a lightweight design

• 50–18,000 Hz frequency response for balanced sound across all genres
• 3.5 mm connector compatible with phones, tablets, and audio devices
• In-ear fit with secure, comfortable wearing style
• Durable construction weighing just 20 g for all-day portability
• 36 Ω impedance optimized for portable devices

These headphones suit anyone who prefers the reliability of a wired connection—whether you're commuting, working out, or enjoying music at home. They're an ideal choice if you want straightforward sound without pairing hassles or battery worries.