When I installed the key holder that fits into the case I put a few drops of gorilla gel superglue on the plastic piece. This makes the FOB case much stronger. In fact, the original keychain was glued the same way. I had to cut it out of the case. If you assemble it this way, I think the key fob will last as long as your original key. I have a 2008 Lexus Rx 350.
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