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