Sonova Holding AG designs, develops, manufactures, and distributes hearing systems for adults and children with hearing impairment. It operates through two segments, Hearing Instruments and Cochlear Implants segments. It offers wireless communication products, rechargeable hearing aids, and professional audiological care services. The company provides hearing instruments under the Phonak, Unitron, and Hansaton brand names; cochlear implants under the Advanced Bionics brand; and professional hearing care services under the AudioNova, Audium, AuditionSantÃ©, Boots Hearingcare, Connect Hearing, Fiebing, Geers, Hansaton, Lapperre, Lindacher, Schoonenberg, Triton, and Vitakustik brands. Sonova Holding AG sells its products through wholesale companies and independent distributors; and provides professional audiological care services through a network of approximately 3,500 stores and clinics. It operates in the Americas, Europe, the Middle East, Africa, and the Asia/Pacific. The company was formerly known as Phonak Holding AG and changed its name to Sonova Holding AG in August 2007. Sonova Holding AG was founded in 1947 and is headquartered in StÃ¤fa, Switzerland.