Groundspeak official sticker to put outsite your car.

How to put the sticker on your car:
Make sure the glass is clean.
Carefully peel the backing from the decal.
Place the decal on your vehicles glass (be careful, once the decal touches the glass, is it difficult to make position or orientation changes).
Gently peel the protective layer from the front of the decal.
Go geocaching!

Size: Width: 10 cm
Height: 11 cm