An industry staple, they are comfortable and accurate. AKG K240 Studio Headphones include a removable cable and Varimotion technology for enhanced bass response. The headphones' 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. The circumaural (around-the-ear) pads are designed for hours of wearing comfort, while the K240's steel-cable, self-adjusting headband construction and single-sided professional-quality audio interconnect ensure extended reliability in demanding professional studio applications. 55-ohm impedance. Features: - 55-ohm impedance - Removable, serviceable cable - Varimotion technology for enhanced bass - Grab the AKG advantage. Order today and save. Specifications: - Type: semi-open, circumaural - Frequency range: 15Hz-25kHz - Impedance: 55 ohm - Sensitivity: 91dB/mW - Power handling: 200mW - THD: < 0.25% - Connector: gold-plated, 1/8" stereo mini jack and 1/8"-1/4" adapter - Net Weight: 8-1/2 oz. What's in the box AKG K 240 Studio Professional Semi-Open Stereo Headphones Gold-Plated 1/4" Adapter Detachable Cable