I've talked about this before I think, way back with my 1st one. For a few reasons that aren't important I quit using it for a while, then moved on to a new one in the last few weeks.
I'm talking about my USB medical alert. It's simply a USB that you wear on a necklace or carry on a keychain (some also are bracelets or watches), and it is programmed so that you enter in all your health info. Which can be very important in an emergency.
I proved this the other night when I was far too ill to remember my drug allergies. I was able to give it to them, they plugged it into their computer, and were able to get everything they needed. The entire ER staff was really interested and really glad I had it. They'd never seen one before and a bunch of them wanted to buy them. I'm so glad I had it because it's hard to tell what med I might have taken if I hadn't had that; too many allergies to remember when groggy, and I was literally at a point of being pretty mentally confused when I got to the hospital. (Thank God for the rash or things might have gotten really bad without my realizing it was emergent that I do something).
Anyway, the one I use (there are lots) I picked because you can see screenshots of the program and I knew it was one that would fit my needs well. I really want the watch one this time, but couldn't find it in a design I liked. So the one I got comes from Critical Access, cost $19.95, and is now extremely highly recommended, now that I used it and it worked. There are ones designed more specifically for kids, and if I were buying one for a child I'd look for this, simply because what I have is kind of long and would be heavy to a child.
I do wear a standard medic alert dogtag with it because the USB doesn't have a design or words on it that indicate clearly that it is that kind of device, and because I need people to see immediately that I wear and MAOI because in an emergency they need to know before anything else that I can't have some meds. That one says in full "MAOI; Tetanus shot allergy; Muliple med allergies; see USB." It was around $10 on Ebay and I like it because it is pretty blue.
So there's a great Christmas gift.