Product Material: The equipment is made of high-quality plastic. It can withstand extreme outdoor temperatures, and the sticker will not damage the bumper. Practical design: Design with humane animals. Use natural wind, ultrasound and physical phenomena to drive different animals. Protect animals from harm. At the same time, it will not disturb people. Easy to install: just tear off the glue on the back of the alarm and stick it on the front bumper or grille of the vehicle. Easy to install, no need to drill. It can be installed on all types of vehicles. Safe insect repellent: Repel all animals that respond to high-frequency noise. For example, deer, dogs, and cats can protect animals from harm. Reduce the risk of accidents. Package Included: 6Pcs Ultrasonic Car Whistle Warning Note: 1.Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) 2.The color of the actual items may slightly different from the listing images due to different computer screen, Thanks for your understanding.