DescriptionThe warning whistles get rid of wild animals through emitting a mixture of ultrasonic, frightening the animals. Device will begin to work whenever a slow moving object is detected and will return to hibernation mode in normal times. They can be installed on the car, motorcycle and any places you like.Features-Color: Black. -Material: Plastic. -Size: About 5x3.5x2cm/1.97x1.38x0.79 inch. -Durable, fine workmanship, comfortable hand feeling. -The products are small in size, suitable for most vehicles installation. -Paste type, easy to install. -All-match black color, not against harmony. -Small body but super loud voice.