AKG K 240 Studio hi-fi stereo headphones boast XXL speakers with Varimotion diaphragms for higher sensitivity, a wider dynamic range and higher sound levels. Semi-open earphones offer true-to-life sound with a solid bass range and clear highs. Comfortable for even long stretches of use, they work great with portable equipment (CD players, DAT recorders, notebook computers, etc.)AKG K 240 Studio Features:55 ohms impedance, plug-in cableSelf-adjusting headband for optimum fitSingle cable for ease of useSemi-open, circumaural design