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Why does the button to unlock your car work from a longer distance if you hold the key to your head?



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I should have worded the question better, i meant why does it work at a further distance when you hold the metal part of the key directly to your head so its physically touching you. Please try it is 100% true and works every time. Hope someone can answer this the curiousity is killing me! Just because it's higher. when it's close to the ground the signal is weakened.