Made for Apple iPod, iPhone and iPad functionality<br>Close-proximity high sensitivity microphone. Achieves highest output sensitivity in its class with 105 dB SPL sensitivity at 1 kHz at 0.1 mV. 85%+ response accuracy from 20 Hz - 15 kHz.<br>Accudriver(tm) high performance, precision matched, balanced Armature drivers. Accufilter(tm) user-replaceable filters that protect the balanced Armature drivers.<br>Includes an assortment of noise-isolating ACCUFIT ear tip options to ensure proper seal and comfort. Custom fit option available.<br>The free awareness! By Etymotic app that was offered with ios-compatible headsets has been discontinued; however, a Pro version with extended features of the original app is available for purchase in the app store.