Hello, 3 stars why I'm happy, but I have problems and I find it is often necessary to change the batteries, because after a while, he began to walk badly, the arrow on the Screen walking by jerks, and then freezes, shaking it a little walk again, finally it is painful, we must change the batteries, and it works again, the downside, you have to do it often, maybe I m 'uses it wrong, still a little lack of explanation, terminated !! thank you but I served well, I advise HH
