Special attention: Please ensure that the installation direction of the sensor is parallel to the ground and the direction indicated on the back of the sensor is correctly facing upwards. Otherwise, there may be issues with sensor sensing. 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: -30~80degC 7. Display Working Temperature: -20~60degC Features: 1. Size of LED display: 9.9 x 2 x 2.6 cm 2. Length of cable of LED display: 5m 3. Size of main control box: 8.9 x 6 x 2.2cm 4. Weight of whole kit: 388g 5. 4 sensors 6. Advanced chipset for enhanced coverage and detecting 7. LED display: digital and 3-color light bar 8. Detect small objects and bars 9. Enable you to prevent dangerous and costly collisions 10. Provide increased safety for passengers, pedestrians and family members who happen to be around the moving vehicle. Package: 1 x Main Control Box 1 x LED Display 4 x Parking Sensors with 2.5m Line 1 x Power Cable 1 x Hole Saw 2 x Double Sided Adhesive Pad 1 x User manual