Ultrasonic Parking Sensor LED display with inner buzzer, or clear loud human voice. Nice looking, stable functioning. Ultrasonic Parking ... Sensor:Digital LED display, can be with "Bi Bi..." alarm, or clear human voice alerting, System turns on automatically when you ... .Obstacle distance displayed on LED in meter, or inches.Fit any make of car or vehicle, van, caravan, trailer and horse boxes. ...