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When it get cold, stray cats like to hide under the car chassis or lie on the wheels，keeping themselves warm in use of the residual heat of motor vehicles. If the cats cannot be found when people start the vehicle, the cat will be crushed to death. In order to avoid the death of stray animals like cats so again due to the negligence of people, the Ami-Friendly vehicle keys also have a function of emitting ultrasonic to drive away cats. When People press the unlock-key toward the car, the car key also sends a wake-up ultrasonic to the sleeping cat under it.
Bergische Universität Wuppertal