??High-quality material: Made of ABS plastic, It can withstand extreme outdoor temperatures, and the stickers will not damage the bumper. Size: 2x1.6x0.9 inch/5x4x2.3 cm, easy and effortless for you to hide in the car body well, providing security without affecting the shape of the car body??Feature: The deer whistle for car bumper is working at the car moving at 35 mph or faster. It is recommended to install two deer whistles per vehicle.??Driving safety accessory: the car deer warning whistle device is an essential car accessory for drivers who drive in the wild, the air passing through the whistle device will produce sound, which can alert deer approaching the vehicle and scare them away, thus effectively avoiding the collision between deer and vehicles??Practical design: Use natural wind, ultrasonic waves, and physical phenomena to drive different animals. Protect animals from harm. Reduce Unnecessary Car Damages from road crossing animals like Deers & Boar. Must have Item for Rural Commuter??Easy to install: just remove the glue on the back of the alarm, and then stick it on the front bumper or grille of the vehicle. In order not to leave marks, you can use car glue remover or use warm water to slowly tear off the deer repellent, which will take you a few seconds to install without other tools