Welcome to our store! Material: sturdy ABS plastic, resistant to high and sub zero temperatures. People or pets inside the car cannot hear ultrasound. Packaging: 4 deer whistles. Each deer whistle comes with double-sided tape. Feature: When the car is traveling at a speed exceeding 35 miles per hour, the deer whistle on the car bumper works. The sound of a whistle can remind deer to prevent deer or other wild animals from colliding with cars. Easy to install and disassemble: Remove the cover from the tape and stick the device to the grille or top of the engine hood. Clean the vehicle before use. It can also be easily removed from the base for cleaning. Compatibility: Compatible with all cars, such as motorcycles, SUV trucks, ATVs, etc., it can save many lives! 100% satisfaction: Our customers are our top priority. If you find any product issues after receiving the goods, such as damage and incorrect quantity, please contact the seller immediately. We will do our best to provide you with satisfactory after-sales service.