**2.4.2 High-frequency hearing loss**

Newer devices, such as the BAHA™ system manufactured by Entific Medical (Medical Advisory Secretariat, 2002) have been developed for patients diagnosed with unilateral profound sensorineural hearing loss, also referred to as single-sided deafness. Other devices have been designed for patients exhibiting severe high-frequency transposition hearing loss and comprise self-learning features on hearing aids and cochlear implants that allow integrate of actual measurements. Finally, an infrared wireless headset is used with television for listening at a higher volume than others sitting in the same room. Bluetooth interface allows persons to hear telephone conversations more easily, amplifying any devices that employ this technology.
