Etymotic makes the world's most accurate noise-isolating headsets and earphones in all price categories. All low-cost earphones are made with dynamic (moving coil) drivers that have undesirable frequency response peaks and weak highs. Etymotic created a design that makes dynamic drivers sound like high-end drivers by inserting a proprietary acoustic side-branch to redistribute energy， smooth the peaks and compensate for weak highs. Features:- Tight， accurate bass with crystal clear high frequency detail at all listening levels<br>- 35 dB - 42 dB of noise isolation<br>- Documented highest noise isolation of any earphones or headphones on the market today<br>- Programmable noise-isolation feature using the AWARENESS! HD App made for Android Google Nexus 7<br>- High-gloss polished aluminium finish in 4 chromatic colour options<br>- An assortment of noise-isolating ACCU-Fit eartip options ensure proper seal and comfort<br>- Kevlar-reinforced cable for durability<br>- ACCU-Filter User-replaceable filters that protect the moving coil driver from ear wax<br>- Best communication and control<br>- Close-proximity high sensitivity microphone<br>- Made for Apple iPod， iPhone and iPad control functionality