For my parents, and now my dad.
A usb telescope
Afternoon tea out voucher
A rocket book - note book you can erase with heat - unfortunately it didn't link to my dad's phone but he still loved it.
I was going to get an alexa but he's scared to use mine.
Cordless phone - I got this when my mum had terminal cancer so they could have a phone upstairs without need to wire it in.
USB which I put music on as my dad's car has an MP3 slot.
A couple of years age I had a conversation with my dad about dialect and English and then sent him David Chrystal's book, this has led to him reading more about linguistics so I've followed up with a few more.
One year I got my mum a box of bulbs, they were different flowers and the box was designed that you just buried the entire thing.
A digital photo frame, particularly if you pre load it with family photos.
I have a Fuji instant camera, my dad likes it because he can have actual photos that he can take to church to show people.
My mum used to sleep with the radio on using an ear piece, I got her a pillow with a speaker in it.
I also got a mini tool kit, it looks like a book but it has small screwdrivers etc which are ideal for fitting the screws in glasses.
A citizen eco watch for my dad, it's battery is charged by day light so he never needs a new battery.