Can't read screen

The telephones, themselves, are OK and easy to setup. However, the screen which shows incoming callers, stored data, etc is close to impossible to read and you can't brighten the screen to improve visibility. I have good eyesight but can't easily determine, fo example, incoming caller unless I shine a flashlight on the screen. Unfortunately I can't return these phones for a refund and so will dump them and purchase a set that has a screen display that easily can be read.

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