Napoer Car Parking Sensors Reverse Radar with Human Voice Alert Black Provide 4 sensitive ultrasonic sensors, ensures your traffic security omnibearingly, providing increased safety for passengers, pedestrians and family members who happen to be around the moving vehicle. Real people voice with English speech alerts you section by section according different distance, closer the distance is, the alarm sound is shorter and rapider. Accuracy of obstacle distance can reach to centimeter. Self-inspection system can automatically check abnormal condition itself, avoiding reversing collision due to damaged sensors. The sensor color is same as the car, like the original part.