Car Rear 4x Parking Sensors Reverse Kit Audio Universal Buzzer Alarm LED BLACK FREE SHIPPINGColor: Built in 4 sensor with speaker Parking system suitable for almost all vehicle types, which offers you the best possible safety when parking and maneuvering. This set consists of a parking aid with 4 ultrasonic sensors and a loudspeaker. After easy installation, the system works fully automatically. Thanks to the small sensors, you can observe the nourishing object. Beeps will sound an audible warning to prevent damage to the vehicle. Technical