Compact dual construction: these vehicle deer whistles feature dual construction and one single mount, and the size of each whistle measures 1.18 inch/ 3 cm in length, 0.98 inch/ 2.5 cm in width, 0.67 inch/ 1.7 cm in height, which is small size and easy to hide in the grill Reliable materials: these truck deer whistles are made of ABS plastic, they are study and lasting, and can work well even in hot or cold weather conditions; Moreover, they also adopt strong acrylic double sided tapes on their backs, and are easier to fix, which will not break your car paint, you can remove them with citrus remover or other removers Practical Tool: This deer whistle comes with 10 whistles, 5 emitting sound waves and the remaining 5 emitting ultrasound. It uses airflow to generate sound waves/ultrasounds, alerting deer, elk, moose, antelope, and kangaroos approaching the vehicle, effectively preventing collisions. People and pets inside the car (such as dogs and cats) cannot hear it; only animals outside the vehicle can hear it. Upgraded version: the car grill deer whistle is the 6th generation that features tiny body, dual construction and two wave frequencies; It has a better deer repellent effect and is easy to install, just simply remove the adhesive backing and affix the deer alert; Moreover, the deer whistles are wind activated and can be activated by driving Wide applications: these car deer warning whistles are applied to warn deer, dogs, coyote, foxes and other animals not to get close to vehicles; They fit most cars, such as SUVs, trucks, motorcycles, ATVs and so on Features: Package contents: You will receive 8 pieces of truck deer horns in black. The sufficient quantity and compact design can meet your daily needs and replacements, you can also share them with your friends and family. Ideal gifts for drivers: You can send these car bumper deer whistles as daily gifts or holiday gifts to the drivers around you, on Christmas, Halloween, Thanksgiving, New Year, birthday, housewarming party and more, to show your love and care, and enhance your relationship. Specifications: Material: ABS plastic, acrylic Main color: black Size: approx. 1.18 x 0.98 x 0.67 inches/ 3 x 2.5 x 1.7 cm Quantity: 8 pieces Package includes: 8 x Deer whistles Notes: Manual measurement, please allow slight errors on size. The color may exist slight difference due to different screen displays.