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Message: <blockquote data-quote="Schwepps" data-source="post: 435320" data-attributes="member: 3592">Sorry bro, but Proton and other cars use radio frequencies, around the 300-400MHz in the HF zone. In hindsight, I guess BMW probably uses radio frequencies too, because infrared is just too directional and easily blocked to be used for auto key fobs. Unless they use an extended IR system. Doubtful.Mobile phones also use radio frequencies. Ours is GSM 900, which is around 900MHz in the UHF zone. Nothing to do with worldwide cover or satellite transmissions (which are microwaves at 3-30GHz)My point was that V-Kool doesn't seem to block the 3-400MHz fobs of other cars nor 900MHz of our mobile phones. Why should it block BMW fobs if they're also using radio frequencies? If they're using IR which V-Kool blocks, that would explain it. However I doubt it, so mystery still there.</blockquote>