Headphones; earphones; earplugs for sound-deadening; audiometers; amplifiers, filters, digital and analog signal processors, special purpose electronic circuits and chips for signal processing, speech enhancement processors, voice controlled electronic circuitry, digital active noise reduction circuitry, and audio interfaces for communications systems, all for use in and/or together with earphones, headsets and audio systems; sound amplification, silencer and noise elimination circuitry for use in and/or together with earphones, headsets and audio systems for the filtering, reduction or elimination of extraneous noise or sound, and related electronic circuitry and devices used outside of the auditory canal in conjunction therewith; earplugs for divers; two- or multi-directional communication systems, radio systems and intercom systems comprising microphones, earphones, headsets and/or communications transducers and associated electronics communications transmitters and receivers with amplification, filtering, noise reduction, noise elimination and/or voice-activated control circuitry; communications, radio and intercom systems comprised of transmitters, receivers, microphones, earphones and electronic noise filters, all with integrated sound - and noise eliminator functions or with noise eliminators for the filtering, reduction or elimination of extraneous noise or sound; microphones, earphones, headsets, loudspeakers and sound transducers; microphones, earphones, headsets and sound transducers with integrated sound - and noise eliminator functions or noise eliminators for the filtering, reduction or elimination of extraneous noise or sound; electronic circuitry; computers, computer peripherals, integrated circuit computer chips and electronic computer circuitry; software for use in digital signal processing and enhancement, noise filtering, and in the filtering, reduction or elimination of extraneous noise and sound, and for two-way radio communication in highly stressful, noisy and difficult environments; electronic testing equipment and electronic sound and wave analysis apparatus for testing, tuning and evaluating sound amplification, transmission and filtering in highly stressful, noisy and difficult environments

Hearing aids; noise suppression hearing aids; impulse noise protection hearing aids; audiometers for medical use; intelligent adaptive hearing aids and speech assistance communications devices for use in combat, in battlefield conditions, in military, military special forces and law enforcement activities, in noisy aircraft, watercraft and vehicle environments, and in highly stressful, noisy and difficult environments; hearing protectors for medical purposes, namely sound mufflers for ear protection, ear plugs for ear protection, ear phones, headsets, ear cuffs and specialized electronic circuitry designed to analyze, enhance, filter, reduce, minimize, muffle, convert and/or dampen communications, sound waves, shock waves and other interferences entering the auditory canal, all for medical purposes

Education and training services, namely providing educational classes, seminars, group and individual training on intelligent, adaptive hearing and communication techniques in combat, in battlefield conditions, in military, military special forces and law enforcement activities, in noisy aircraft, watercraft and vehicle environments, and in highly stressful, noisy and difficult environments; providing educational classes, seminars and conferences, and training services in the field of audiology, hearing devices, electronic amplification and filtering devices, microphones, digital active noise reduction and filtering, and digital and analog signal processing techniques