Without trying to sound like a commercial, NightStar is way better than the other shake lights. They claim to be the original and that others are infringing on their patents. I have one of the full-size older ones (newer ones are said to be brighter) and love it. It uses a capacitor. It uses repulsive magnets at each end instead of clunky rubber bumpers for the main magnet. It's solidly built, feels well-made. Completely sealed, including the switch, which uses a magnetically-activated reed switch. It is decently bright, which means it is fine for navigating around the house or back yard or walking the dog. Would I like to be brighter? Last longer? Sure. But for what it is I am very satisfied.

Steve

Disclaimer: I have no relationship to NightStar in any way other than being a customer.
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"After I had solaced my mind with the comfortable part of my condition, I
began to look round me, to see what kind of place I was in, and what was
next to be done"