... Left and right obstacle indication 3.Buzzer alarm switch:on/off Wireless car reverse parking aid system 1,Numeral and color LED display ... 2, Step-up buzzer alarm 3,Left and ... 0.3m5,Display unit with built-in buzzer6,Buzzer alarm switch:on/off7.Wireless between display and control unit TypeLED Parking sensorBrandNeutralModel ...