Estonia - that's it - apparently you have to avoid driving in the rain or they fill up with water, LOL. (Both those ones and the all-clear ones from what I understand.) I think it was on Amazon someone said where they've melted the two halves together, it's a very poor seal.
There's a picture of the all-clear ones here - 4th row down, 2nd picture in:
http://snipurl.com/2a7eruj