Do these deer alerts devices really works for your car? Yes, there are many friends proclaimed that they never hit a deer after using our deer whistles. In principle, these whistles will make ultrasound while the car speed reaches 50Km/h, you can blow it with mouth before installation to check, and you will hear the sound part that human beings are able to. Actually, compare to worrying about being hit by a deer and even having a car accident, causing irreparable damage, the cost of life, car damage, and increased insurance premiums, this is indeed a very good choice.
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