• 1970 - Koss set the standard for full-size professional headphones with the iconic Pro/4AA
• LEGENDARY SOUND - The first dynamic headphones to deliver true full frequency and high fidelity performance
• ICONIC DESIGN One of the most recognizable headphones around the world
• NOISE ISOLATING Over ear design with superior noise isolation
• COIL CORD Compact 8 ft coiled cord with 6.3mm (1/4 in) plug
• HIGH FIDELITY AUDIO 250 ohms / 10-25,000