My grandmother has been having trouble with her cordless landline phones. I wanted to get her something that work with her issues. She has degenerative condition, so everything is blurry for her. Luckily, she's still mentally sharp as a tack. She's gotten by through memorizing where things are. She's also terrible about asking anyone for help. So she'll write down a number in 6 inch letters, and can feel the keypad from there.

I'm hoping to find something with a single on/off button. That would make it much easier to turn on and off, yet sense to be uncommon on landlines. She really doesn't need any other features. She's in the us, of that helps. Thanks