Specifications: Rate voltage: 12V DC Rate operating range: 10.5V - 16V DC Rate current: 100mA - 300mA Ultrasonic frequency: 40KHz Control moudle working temperature: -30 - 80 celcius degree Display working temperature: -20 - 70 celcius degree Sensor diameter: 18mm Installation mode: Drilling Sound: Heart beat type more recent alarm more rapidlyOur products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to out all orders within three of purchase, and the estimated time is 8-15 .When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it