Bought the black and the blue carbon fiber keyfob cover. I had issues with the black one and couldn't unlock, lock or start my car. I swapped out the battery and the kefob works fine without the cover on but will not work at all with the cover on. Strangely enough have 0 problems with the blue keyfob cover. At this time the black cover is a nice decoration in my junk drawer, and think that a keyfob cover would actually allow the keyfob to function properly. Wouldn't recommend the black one at least to anyone.