Lenticular Traffic Lights...as you move the keyring...the lights change colour
Just like Magic..
I've tried to show this in the 2nd and 3rd photos - in the first the red is brighter, in the 2nd it's the green that glows.
AND...on the back is a St Christopher...for those times when you need someone to watch your back..
The traffic light part is 3cm tall and is made of some sort of light metal.
GERMANY stamped on the ring and underneath St Christopher
DO NOT leave home without it..