It could be considered a training knife, fidget device, or cyberpunk accessory, but the Shiny Knife is only made for one thing - looking cool in the dark.  Activate the blade by squeezing or locking the trigger.  Go somewhere dark, swing it, spin it, accidentally fling it into the background! 
 
Clear blades work with a variety of LED colors.  The first color listed will be the color on the spine side of the knife, and is more prominent than the bottom/edge color.  If a color or combo is not listed, it's because it doesn't work well or as you might expect.
 
Replaceable battery included.  Sheath has been discontinued in favor of single and double ring clips, sold here.