In addition to a digital photo frame, I’ve mounted a laser pointer to the brace on my arm.
I can turn it on and wiggle it, to make the cats go crazy and chase it.
It runs on a pair of AA batteries so it lasts a long time. And the switch is a toggle, so I don’t need to hold down the button to keep the laser on.
I had a good time with it, until I fell asleep with my arm pointing out the window, flashing into the cockpits of airplanes landing at the airport two blocks away.