AKG K240 Studio Headphones feature a classic design that has become a standard in monitoring. This newer, lower impedance, 55-ohm version provides remarkably higher volume level when used with portable studios, keyboards, drum machines and other project studio gear. It's a professional level of performance for the home studio. Features include an integrated semi-open air design with a highly accurate dynamic transducer for naturally open sound quality, and circumaural (around-the-ear) pads for hours of wearing comfort. Frequency range: 15 Hz to 25,000 Hz. Stereo (1/8-inch minijack and 1/4-inch) connections. AKG K240 Studio Features: Low, 55 Ohm impedance, plug-in cable, Self-adjusting headband for optimum fit, Single cable for ease of use, Semi-open, circumaural design. AKG'S MOST POPULAR PROFESSIONAL HEADPHONE. A classic design which has become a standard in monitoring. Now with Varimotion XXL capsule for studio sound at home and for portable use. The 'integrated semi-open air' design incorporates a highly accurate dynamic transducer, and an acoustically tuned venting structure behind the element produces a naturally open sound quality.