Professional noise-isolating in-ear monitoring headphones that are optimized for live performance and use with guitars, bass guitars, drums and keyboards. A refined and perfected proprietary in-ear driver design that is using the premium 10mm permanent magnet dynamic loudspeaker in a solid brass housing, was engineered to deliver the highest sound quality directly and beautifully fits into the ear canal where it belongs. And of course, it delivers the sound that made Wi Digital Systems famous: brilliant instrumental sounds and vocals with crystal clear high notes, defined mid range, and rich, powerful low end for an excellent sound experience. Engineered with bendable metal reinforced ear loops, the headphones are superbly constructed to ensure a comfortable fit and secure placement that will not slip or move, while the exclusive tangle and kink resistant cable is designed to resolve itself quickly and easily with a simple and gentle shake. The headphones can provide -26dB of isolation and passive noise cancellation when properly worn, and can be used in all types of weather and environments. These headphones are fully compatible with wireless transmission systems and portable media devices. Input sensitivity: 97 dB. Efficiency: 102 dB @ 1 kHz, 1 mW. Frequency response: 10 Hz-22 kHz. Impedance: 16 Ohm.