Replacement Key Fob Cover fit for Sonata Tucson Elantra Keyless -4 Button-b About this item 4 button replacement key shell fit for Hyundai Sonata Tucson Elantra Keyless Entry Key Fob . This replacement key cover must be cut the blade by a dealership, a locksmith, or your local Ace Hardware to match your car and remove the remote set(crucuit board and chip) to this new cover. This Cover is a good material replacement cover for broken or worn keys.It looks like a new key after you use it.and the new shell does not affect the key fob signal. Easy installation which does not require reprogramming.high quality ABS plastic not easy break and scratch.