... 40kHZ, 2.Buzzer Sound Pressure Level: >80dB Parking Aid System Features:1.Color Display indicates obstacle distances as well as ... ,3.Components Included: 4 sensors/ECU/ buzzer/buzzer cable/power cable,Audible alert, the closer the obstacle, the faster ... °,10.Audio Warning:5 status,11.System activates automatically when reverse gear is engaged. parking aid system with hight quality and reasonable cost