Specifications: 1. Digital LED showing obstacle distance 2. 4 sensors for rear available 3. Alarm by Bi-Bi sound 4. SmallLED display with two colors (Red & yellow) 5. Crescent shape digital display screen 6. Turn on/off the voice according to your desire 7. All kinds of sensor colors and styles are available 8. High quality and easy to install Technia: 1. Rated Voltage: 12V DC 2. Operating Range: 10.5V to 16V DC 3. Rated Current: 50mA to 180mA 4. Detecting Distance: 0.3 to 2.0m 5. Ultrasonic Frequency: 40KHz 6. Display Working Temperature: -30 to +70 Centigrade