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Remote keyless entry fobs emit a radio frequency with a designated, distinct digital identity code.

A security concern with any remote entry system is a spoofing technique called a replay attack, in which a thief records the signal sent by the key fob using a specialized receiver called a code grabber

The device transmits a jamming signal to block the vehicle’s reception of rolling code signals from the owner’s fob, while recording these signals from both of his two attempts needed to unlock the vehicle. The recorded first code is sent to the vehicle only when the owner makes the second attempt, while the recorded second code is retained for future use.

Source: https://en.m.wikipedia.org/wiki/Remote_keyless_system

Bone conduction is the conduction of sound to the inner ear primarily through the bones of the skull, allowing the hearer to perceive audio content

Wikipedia

Bone conduction products are usually categorized into three groups:

•Ordinary products, such as hands-free headsets or headphones

•Bone-anchored hearing aids and assistive listening devices

•Specialized communication products (e.g. for underwater or high-noise environments

Wikipedia

the Frey effect, consists of the human perception of sounds induced by pulsed or modulated radio frequencies. The perceived sounds are generated directly inside the human head without the need of any receiving electronic device. The effect was first reported by persons working in the vicinity of radar transponders

Wikipedia

Kindness is a type of behavior marked by acts of generosity, consideration, rendering assistance, or concern for others, without expecting praise or reward in return. It is a subject of interest in philosophy, religion, and psychology.

Wikipedia