I bought a Talking Button Clock, and a keyfob version, which I put on a lanyard round Mum's neck. They are primarily for the visually impaired, I think. The clock is a large white button, about the size of half a tennis ball. With both you press once for the time, twice for the date and day, but no other options. The voice is loud and clear. Of course, not every PWD will understand how to work them, but luckily Mum has (for now, at least). Bonus is they are cheap - £10 ish for keyfob, £15 for clock, when I got them a couple of years ago. It has, for the most part, stopped the "Is it Monday? Tuesday? Wednesday? etc."!