Features: 1. After entering í¦Rí¦ grade, the system will work automatically. 2. The sensor's sensitivity is 2~3 times better than others. It can even detect 2mm steel wire. The detection error is í_2 cm. 3. Detecting distance is 0.30-2.50m.It has wide detection angle and less blind zone 4. It measures 4 times /second. It can react to quickly moving objectives. 5. It can operate in rainy, snowy and foggy days. It has high anti-electromagnetism. 6. Clear display, self-locking connection, inlay sensor fitting, and anti-mistake distance measuring technology. 7. The product service life is longer than automobile service life. It has 3 years guarantee. 8. It has 4-way sensor. The standard cable of display is 5m. Technical data: 1. Working voltage: DC10V~15V 2. Max. Power: 2W 3. Working temperature: -30íµ~ +70íµ 4. Detecting distance: 0.30m ~ 2.50m 5. Measuring error: í+0.02m 6. Alarming Volume of external Siren: 60dB 7. Response Time: 250ms 8. Ultrasonic Frequency: 40KHz 9. Current Consumption: