Around 60 per cent of the human body is made up of water. And water, Kyle explains, responds in a very helpful way to electromagnetic waves when inside a cavity, like your body. When the radio waves from the key go into your water-dense body, a ‘dielectric resonator’ is created. This increases the amplitude of the waves, and thus, the range of the signal.
Unlock your car from further by holding the key to your water-filled head
