The 3.5 mm noise reducer is perfect for all headphones/IEMS using a 3.5mm headphone jack. Simply connect the iEMatch between them and your source for reduced background noise and hiss. Some headphones are more sensitive than others so the iEMatch has both High and Ultra sensitivity settings to boost your sound. It also provides a more open and transparent dynamic range and increases the usable volume range. The pack includes memory foam earplugs, an aeroplane adapter and travel pouch. A perfect little travel kit – great music and the chance to enjoy a power nap.