Usage Tips:The mouse repeller uses a single-chip microcomputer chip to generate an ultrasonic frequency of 24KHz, which can effectively stimulate the auditory system and nervous system of the rodents, and make the rodents feel uncomfortable and irritable, so as to make them stay away from the sound source and achieve the purpose of driving away. Humane and Safe to use around your family and pets, all house hold electronics. Repels by using specially designed dedicated sounds above the human hearing. The car rodent repeller ultrasonic that environmental friendly to drive away rodents without killing them. They are also no harm for pets and kids. It has a vibration detection function. When the car starts, it will drive the product to vibrate. The product will stop working when it detects this situation. At this time, rats and other pests will not harm the car and reduce power consumption. Don't need to use another power supply, easy to install and use. Specification: Material: Plastic Rated Voltage: 12 (v) Rated Frequency: 12 (hz) Rated Power: 0.24 (w) Size Chart: Size: 116x65x29mm/4.57x2.56x1.14inch Cord Length: 30cm/11.81inch Package Includes: 1 Piece Ultrasonic Vehicle Rat Expeller Note: Please allow 1-3 cm/ 0.39-1.18 inch difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!