In pearl illegible keyboard

Has got off the phone to my father bought as an accessory for Gigaset SX353 because it lt moment. Gigaset website in many functions compatible.
Essentially, it lived up to expectations, also with regard to compatibility with the base.

However, the pearl-white design has a serious drawback:
The yellowish backlit numerals have, depending on the ambient light hardly contrast with the buttons and are therefore difficult to read (especially for the elderly).
In the black version, this problem should not exist.