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The only issue I have with those smart keys is that they will eventually be hacked. A university figured out how to hack into remote keyless entry for cars within a few weeks. The encryption used for that has not been changed since it first started coming out in the 80s. I'm not sure if the SmartKey uses the same encryption tech, but either way its really only a matter of time till someone figures it out. Physical keys will still be safer.
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