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Cats that seek shelter under the hoods of cars can then be injured or killed when that car is started. 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 Ani-Friendly vehicle keys also have a function of emitting ultrasonic to drive away cats. When People press the unlock-button toward the car, the car keys also send a wake-up ultrasonic to the sleeping cat :"We are going to leave now, please move to somewhere else to sleep!"