This is for dad who has very weak and narrow field of vision. The size of the buttons is big because not only are the numbers big enough to be read, but the buttons themselves are big enough that he doesn't have to press two or three buttons at the same time. However, the buttons on the top are accidentally pressed when he's holding the phone. The "Hold" button doesn't mute it, it just adds poor quality music that's more like cross-interference in your conversation. The handset is also very light and detaches from the base very easily, depending on whether the phone will be wall mounted or placed horizontally.
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