What's the most outdated piece of technology you still use today?

I don't own a smartphone, I use a flip phone. The phone itself isn't particularly old, but I suppose the technology is.

I use a hand-cranked coffee grinder.

Still have my apple iPod, still works, keeps a charge. Great for running (who wants to carry your bulky iPhone!)

They are fetching a good price on eBay.

I have a Roland D-50 keyboard that I bought in 1987.

xbox one x

I've also got a wireless mouse I still use. In 2009 I put together a PC dedicated to creating videos. I've got audio and video cables from my DVR to it, and can create DVDs of programs I want to save. I generally don't bother going that far anymore, just record them as MP4s and keep them on my computers. Anyway, when assembling that I used a wireless mouse. I can't even remember why now. But the funny thing is, that mouse is the only one that PC will accept now. Well, it still works, so no problem.

I've also got an old, refurbished laptop I have Linux installed on. My main PC, the one I'm using now, had both Windows 7 and Linux installed, and is much more powerful than the laptop. The development environment for Windows is much better than the one for Linux, so I use Windows when writing software. But there are times I want to check the code's portability, so having that Linux laptop on my home network is very convenient. I'm not sure how old the laptop is, but I'm guessing it was new at least ten years ago. When it arrived here it had XP installed on it.

I also have two iPads. The older one is about ten years old, and the newer one is about a year old. I didn't bother to transfer photos and files from the old one to the new one, since I still have the old one. But I use the old one mainly as a clock in my bedroom. I have an atomic clock app which has a nice, large display, easy for even me to read (I'm quite nearsighted), and I leave that running at night.

I know what you mean about batteries. I've got a small alarm clock I use mainly when traveling. It has an LCD display and uses a single AAA battery. I've had that for about thirty years and have had to change the battery only four or five times.

I use a knife to chop food.

I use a CD player in my car. I burn CDs often to replace the scuffed or melted ones.

I have a digital radio alarm clock that is over 45 yrs old and is the most sturdy reliable machine I have ever had. Sits by our bed and I still use it.

I use pen and paper together to write things down.

I burn cds and listen to them in my car. Also I bought my 32" Samsung 720p HDTV in 2008. It's starting to have pixelated lines on my screen when I turn it on but they go away after a few minutes. I'm hoping to upgrade to a 4k tv this year.