For BMW Key Fob CASE :Just the case no electronics or circuit board,come with logo For BMW key fob cover:Pls do not missing the spring when you open the case,Easy installation which does not require reprogramming. For BMW KEY FOB :Please verify original remote shell, this part is not compatible For BMW Key fob case:This item isn't a remote key, it's just a remote key shell. NO (remote/electronics/ignition or transponder chips) For BMW Remote Key:Best replacement for broken or worn keys, or great for an additional key This item isn't a remote key, it's just a remote key shell. NO interior (remote/electronics/transponder chips) unit inside Pls kindly check out your key blade and button position before buying, make sure your remote key case looks exactly the same with this case Best replacement for broken or worn keys, or great for an additional key Constructed with high quality materials for long lasting durability