Effective ProtectionThe package consists of 6 wind-powered deer whistles for vehicles, which emit ultrasonic sounds to deter wild boars, deer and other wild animals without batteries or maintenance. Harmless RepellentBy emitting a harmless low-frequency whistle, these ultrasonic whistles ethically deter animals such as deer, foxes and wild boars without disturbing humans, ensuring a safe solution for vehicle protection. Durable MaterialMade of durable ABS plastic, these ultrasonic car whistles can withstand high temperatures and various weather conditions, providing reliable protection against wildlife. Easy Installation With easy-to-use double-sided tape, the installation process of our deer whistles requires no tools or complex procedures, allowing for hassle-free installation on any vehicle surface. Simply stick them on the rearview mirror or other flat surfaces of your car or motorcycle. Versatile ApplicationDesigned for different types of vehicles, including cars, trucks and motorcycles , these lightweight and compact wildlife warning devices provide on-the-go protection from a variety of wildlife, improving the safety of drivers and passengers, as well as animals. Note: Data is all measured manually, please allow 1-3cm error due to differences in light and display, there may be color differences, please refer to the actual item received.