You can find this under several names, but be sure to get the frosted one. I got two and even on AA's, they are bright enough to work by. Also they can operate off a pair of 18650's. The blue or red Suboos ones lack magnets on the bottom. Also since they turn on when expanded, the internal friction is barely enough to keep it closed when hanging, so be sure it clicks when shut.

https://www.youtube.com/watch?v=_DR...

https://www.amazon.com/SUBOOS-Ultim...

https://www.amazon.com/Diateklity-C...