Key Specifications/Special Features: • Sensor with self-test function • Three-color LED display • Left and right direction indicator • BiBi-alarm sound or voice indicator• Insert-in and stick-on sensors for option • 2/3/4 Sensor for optional ,all kinds of sensors for optional • Rated voltage: 12V • Operating range: 9 - 16V • Rated current: 20 - 200mA • Detecting distance: 0.30 - 2.5m • Ultrasonic frequency: 40KHz • Working temperature: -30 - +70 degree Celsius