It came in a Parcel with ‘Do not Crush!’ on it from the US.
They’re easy to fit and give a big LED light in (most colours).
However, when I tried to put it on, it only lasted about 5 minutes or so and then I had to press it again. (What is the point of that?!). Maybe it is supposed to be like that to save battery but it is annoying. I will contact the manufacturers anyway just to confirm this.