The TDK Life on Record High Fidelity Heahphones delivers a truly personal listenting experience. On ear volume and mute controls give you the ability to dynamically control the audio output while high perfformace 50mm drivers ensure amazing sound clarity and range. An in line equalizer integrated into the cable delivers a stunning music visual while giving you the ability to adjust the bass/treble levels to your preference. Superior materials and craftsmanship make these headphones look as good as they sound. Tuned by TDK Audio Research Lab to deliver an authentic sound, from extended bass through mid range, to enhance treble. Listen to music the way it was intended. The 4ft extension cable lets you relax across the room from your system specifications power source. 2 AAA (included) 50mm Drivers, 20-20,000 Hz Frequency Response, 97+/- 3dBSPL/mW@1kHz Sensitivity, 200 Ohms +/- 10% Input Impedence.