The T20i is a high performance in-ear headphone featuring revolutionary DualCoil™ dynamic driver technology capable of outperforming conventional drivers in levels of resolution, clarity and detail. The injection moulded stainless steel housings feature a tuning filter system to adjust the sound signature, while a comfortable, noise isolating fit is ensured by patent pending, mouldable over-ear hooks.The T20i in-ear headphone conforms to Hi-Res Audio standards as defined by Japan Audio Society. This logo is used under license from Japan Audio Society.The T20i’s DualCoil™ dynamic driver features an additional voice coil situated within an annular magnet; each coil operates independently to produce part of the frequency range. This unique configuration ensures ultra-efficient performance and true-to-life sound reproduction across all genres of music. The tuning filter system allows users to customise the headphone’s sound signature by increasing emphasis on bass or treble frequencies.The T20i features unique, patent pending over-ear hooks designed to hold the headphones in position with the cable running over and behind the ear. The over-ear hooks offer a more comfortable, secure fit and help deliver effective noise isolation.