Cochlea implants; Cochlear implants made from artificial materials; Digital hearing aids; Ear picks; Ear plugs for soundproofing, other than for medical use; Ear plugs for sleeping and swimming; Earpicks; Electrically-operated hearing aids; Hearing aids; Medical hearing instruments; Medical hearing instruments and parts of such devices; Medical testing devices for measuring hearing loss in patients, namely, audiometers; Otoscopes; Stethoscopes