The car whistle deer-proof device is made of high-quality ABS material, which is very durable and not easy to wear. The air flowing through the device generates sound/ultrasonic waves that provide a warning to the deer, keeping the animal safe. The device is easy to install, compact, portable, and easy to use. Specification: Brand: JOYCOURT Name: Deer Whistles for Car Color: Transparent/Black Material: ABS Size: 1.94 x 1.59 x 0.85inches Applicable: Most vehicles Features: -Material: Made of high-quality ABS plastic, durable, sturdy, and wear-resistant, this animal alarm whistle can adapt to any extreme climate environment; even in severely cold and hot environments, the animal alarm whistle can still work normally to protect you and animal safety. -Usage: Excellent material, durable, easy to carry, lightweight. -Design: The car whistle and anti-deer whistle are compact in design and very easy to carry and use. When the sound is emitted, people inside the car cannot hear it, only animals outside the car can hear it, so it will not have any impact on the driving process.