Etymotic"s MC-3 headset offers sound accuracy, noise isolation, fit and comfort and durability. The patent-pending, highly advanced ACCU-Chamber Acoustic Control Chamber technology modifies standard dynamic earphone drivers to perform at an accuracy response level equal to products costing more. In addition, the MC-Series earphones are designed to be more comfortable for extended wear, and their high degree of noise isolation enables lower-volume listening, to help protect hearing. The MC-3 provides a 3-button micro-control pod with a noise-isolating close-proximity microphone, for easy control and superb call clarity, making it ideal for voice communications, conducting voice recording and iTunes memos as well as listening to music, videos, and other entertainment. The MC-3 earphone and headset, which is forward compatible with the latest Apple iPhone, iPad and iPod touch products includes Made for iPod, Made for iPhone and Made for iPad certifications. BR> Impedance (@1 kHz) 16 Ohms Sensitivity (@1 kHz) SPL at 0.1V100 dB Maximum output 120db Programmable noise isolation User Replaceable ACCU Filters Cable - 4 ft with 3.5 mm plug High-gloss polished aluminum finish Includes MC3 earphones, zipper storage pouch, shirt clip, assortment of eartips, filter removal tool and extra filtersBR> Programmable Noise-isolation Feature using the AWARENESS! for Etymotic App for iPod, iPhone, and iPad Custom fit earmolds Specially made earmolds are available through Etymotic Research. See manual for details