This wild boar warning whistle is made of high-quality ABS plastic, which is resistant to high and low temperatures and can operate even in extreme weather conditions. People or pets inside the car are not affected and cannot hear ultrasonic sounds. 

• Collision avoidance: Ultrasonic whistles emit sound waves, while wind whistles produce sound through wind power. The two types of whistles work together to emit warning sounds. They can prevent wild boars and foxes from crossing the road and entering the path of vehicles, effectively avoiding collisions between animals and vehicles. 
• Easy installation: First, remove the adhesive backing and preferably stick the whistle on the grille, front bumper, rearview mirror, or other flat areas of the vehicle. Then, ensure the large end is facing forward and the deer whistle is level with the horizon. The most logical position is where there is more airflow, followed by the grille and front bumper.
• Wide range of applications: This wild boar warning whistle is suitable for all cars, SUVs, trucks, motorcycles, ATVs, etc. It can be removed from the base and easily disassembled or quickly reinstalled when not needed. 
• Note: The range of the wild boar whistle is a quarter of a mile and is effective only when the vehicle is traveling at a speed of at least 50 kilometers per hour. 
• Packaging: 4 pieces of deer whistles with ultrasound and wind activation. (The sound emitted by the wild boar whistle is above 20kHz and affects only wild boars. People cannot hear the whistle sound and it is harmless to humans.)