Features: Bibi level three heartbeat tone. Professional manufacturing, high sensitivity, high reliability. Made of high quality plastic material,durable in use. 30CM~150CM, the accuracy of centimeter level, accurately indicating the distance of obstacles. Bi.Bi.Bi. beep sounds step by step alarm, the closer the distance is, the faster the alarm sounds. Probe self-test function, prompting the probe abnormal state to avoid reverse collision caused by probe damage. Specifications: Condition: Brand New Material: Plastic Color: Black Rated operating voltage: 12V DC Working current: 20 ~ 200mA Detection distance: 20CM ~150CM; Display distance: 30CM~250CM (cm-level display accuracy) Working temperature: -30C~+80C Ultrasonic frequency: 40kHz 1kHz Package Weight: Approx.271g/9.6oz Package List: 1 * Main Control Box 1 * Audible Alarm Indicator 4 * Parking Sensors, 2.3m line 1 * Power Cord 1 * Hole VI 2 * Double-sided Pads 1 * User Manual Package List 1 * Main Control Box 1 * Audible Alarm Indicator 4 * Parking Sensors, 2.3m line 1 * Power Cord 1 * Hole VI 2 * Double-sided Pads 1 * User Manual 1Professional manufacturing, high sensitivity, high reliability. 2Made of high quality plastic material,durable in use.Bibi level three heartbeat tone. 330CM150CM, the accuracy of centimeter level, accurately indicating the distance of obstacles. 4Bi.Bi.Bi. beep sounds step by step alarm, the closer the distance is, the faster the alarm sounds. 5Probe self?test function, prompting the probe abnormal state to avoid reverse collision caused by probe damage.