Sonova (Sonova Holding AG) – till 31 July 2007 Phonak (Phonak Holding AG) – is a Swiss company that specializes in hearing and wireless systems. Sonova develops and markets hearing care solutions in two segments, hearing aids and cochlea implants. The group operates through its core business brands Phonak, Unitron, Advanced Bionics and Connect Hearing.On August 1, 2007 Phonak AG officially changed its name to Sonova Holding AG.