Koss Porta Pro Classic The ultimate Porta Pro on-ear headphones from Koss, developed back in 1984 Once the most modern and best sounding headphones you could get for your money Today, the Koss Porta Pro is an absolute classic and a retro highlight at the same time. In terms of sound, they still do exactly what is expected of them today. And that is good sound. Ultra-portable headband "comfort zone" adjustment (contact pressure) for a comfortable and secure fit Foldable headband design for safe and space-saving storage Dynamic driver with wide frequency response Oxygen-free copper voice coils deliver deep bass and signal clarity Includes a practical carrying case for safe storage The highly acclaimed Koss Porta Pro has fascinated audiophiles and music lovers for decades and remains one of the most popular headphones worldwide. Originally introduced in 1984, the Koss Porta Pro has stood the test of time due to its impressive performance and portability. Equipped with dynamic elements that deliver a wide frequency response and deep bass, the Porta Pro offers remarkable sound reproduction that creates a rich, detailed audio experience that enhances music enjoyment across multiple genres.In addition to its exceptional sound quality, Porta Pro offers unrivalled comfort. Its distinctive retro aesthetics, light weight and adjustable headband ensure a perfect fit, while the foam ear pads provide long-lasting comfort even during extended listening sessions. Another key feature is portability, as the headphones fold down to a compact size, making them easy to carry in a bag when travelling. With its iconic design, exceptional sound quality and enduring popularity, the Koss Porta Pro has firmly established itself as a favourite and respected headphone option for music lovers around the world. Specifications Frequency response: 15-25,000 Hz Impedance: 60 OhmEfficiency: 101 dB SPL/1mW Cable length: 120cm Connection to source: 3.5mm