1. Sensor type: drilling ( make a hole on car bumper for sensor mounting ). 2. Sensor color: black, white, silver, red, blue, yellow or ordered by customer. 3. LED display uses the latest LED technology, displaying with digits. 4. Easy mounted, suitable for 4 sensors. 5. Operating voltage:?DC 10-15 V. 6. Max. power consumption:?3 W. 7. Operating temperature:?-30C ~ 70C. 8. Alarming volume:?>73dB. 9. Distance for receiving:?0 ~ 30 M. 10. Distance display:?2.0 ~ 0.3 M. 11. Alarming distance:?1.5 ~ 0.4 M. 12. Wireless frequency:?433.92 Mhz.