Crystal cases are designed with facets that line up with the flowlight's button no matter which way your flowlight is oriented, so you can feel and turn on your lights in the dark.
We prefer inserting our flowlights with the head facing downwards as there are two LEDs at the head and this orientation makes for more dramatic light patterns. We offer strong o-rings that you can attach to the tail of your flowlight, so you can easily remove your flowlight from your crystal case.
You can find crystal case o-rings on our website here: http://www.flowtoys.com/o-rings-for-crystal-cases-pair/
If you have any questions, please feel free to contact us!