Save-a-Deer Deer Whistle
At speeds over 35 mpg, air rushing through the Save-a-Deer whistle emits a sound frequency that, warns and may freeze deer, preventing them from moving into the path of your vehicle. According to the manufacturer, this whistle has been tested to be 90% effective and cannot be heard by humans when attached to a vehicle. Its low profile allows mounting where it does not detract from the appearance of your vehicle and prevents breakage from car washes. Made in the USA.