In 2004, Siemens, now Sivantos, introduced Acuris, the first hearing instrument featuring a wireless system, e2e wireless, small enough to fit in CICs.

The history of electrical hearing assistance instruments originated with technological advances in telephones at the end of the 19th century when Werner von Siemens integrated a horseshoe magnet in the receiver of a telephone, and succeeded in substantially improving transmission quality in the telephone.