Silent dog whistle-- the air passing through the deer whistle creates a sound to warn deer in advance, and people and pets in the car can barely hear
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SAVING LIVES & PROPERTY: Air moving through this device produces sound wave that are almost inaudible to human and pets inside the car, to give deer
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【Saving Lifes】This small device can drive animals away while the car is running, avoiding accidents when the animals suddenly cross the road. 【Upgrade
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