This means that the E560 is designed so that there is no interference or noise with a hearing aid.

Quote:
Unwanted noise makes even desirable phone calls with a hearing aid a burden. The large-key phone models in the Gigaset E560 series are therefore hearing aid compatible (HAC) in accordance with the European ITU-T P.370 standard: this means that our cordless phones enable users of hearing aids with inductive transmission to make calls without disturbing noise.

Manufacturer's website: http://www.gigaset.com/de_de...