Useless - does not stick
Don't waste your money here. This is a useless item. Here are 3 things obviously wrong with this:

1) Does not stick: The suction cup does not work. It somewhat works on glass/mirror, but falls off after a short while. It does not stick on any other surface for even a few seconds.

2) Hard to read: Let's say you manage to stick this up on the windshield. You won't be able to read anything. The compass will be upside down when you stick it on the windshield, and that makes the markings almost impossible to read as they are hidden.

3) Size: the compass is way too small, and this makes it difficult to see, especially when driving.

I'd give it 0 or negative stars if I could.