Bose https://www.amazon.co.uk/dp/3659678287/ref=nosim?tag=tosheroon-21

Unmatched Comfort: The lightweight, over-ear design features 20% lower clamping force than the Bose A20 and redistributed weight for better head stability during flight.

Advanced Active EQ: Incoming signals are automatically equalized to provide maximum audio clarity for essential cockpit communication.

Written for students of linguistics, applied linguistics and speech therapy, this dictionary covers over 2,000 terms in phonetics and phonology. In addition to providing a comprehensive, yet concise, guide to an enormous number of individual terms, it also includes an explanation of the most important theoretical approaches to phonology. Its usefulness as a reference tool is further enhanced by the inclusion of pronunciations, notational devices and symbols, earliest sources of terms, suggestions for further reading, and advice with regard to usage. The wide range of topics explained include: * Classical phonology, including American Structuralism and the Prague School * Contemporary approaches, including Autosegmental Phonology, Metrical Phonology, Dependency Phonology, Government Phonology and Lexical Phonology * Prosodic ideas in phonology, both traditional and contemporary ^ * * historical phonology * Intonation and tonology This dictionary devotes space to the various theoretical approaches in proportion to their importance, but it concentrates most heavily on non-theory-bound descriptive terminology. It will remain a definitive reference for years to come.

Precise Microphone: Designed for aircraft with thermal or PTT systems, the microphone increases clarity and reduces ambient noise during transmissions.

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Certified Reliability: The rugged construction is built to meet FAA TSO and EASA E/TSO-C139a certification standards.