Car Auto Parktronic LED Parking Sensor with 4 Sensor Reverse Backup Car Parking Radar Monitor Detector System Backlight Disp Specifications: 1. Rate Voltage: 12V 2. Operating Voltage Range: 9~16V 3. Rate Current: 20~200mA 4. Detecting distance: 0 - 2.5m 5. Ultrasonic Frequency: 40KHz 6. Working Temperature: -30~80C 7. Display Working Temperature: -20~60C Features: 1. Size of LCD display: 75 x 50 mm 2. Size of main control box: 9.7 x 7.2 x 3cm 3. 4 sensors 4. Advanced chipset for enhanced coverage and detecting 5. LCD display: digital and showing obstacle distance 6. Detect small objects and bars 7. Enable you to prevent dangerous and costly collisions 8. Provide increased safety for passengers, pedestrians and family members who happen to be around the moving vehicle. Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.