Thule Rapid System 753 7531 YBX3000 Feature S4 S30 S32 S34 Maximum space efficiency across Feature S4 S30 S32 S34 Method of Arming Radio Radio OE Radio Immobilisation Circuits 1 2 1 1 Key Theft Protection (via Keypad) Y Y Y Y Auto arm Auto rearm (Passive Arming) Y Y Y Y Ignition Detection Circuit (or Internal Panic Button Facility) Y Y Y Y Door "+" Protection Circuit Y Y Y Y Door " " Protection Circuit Y Y Y Y Combined Boot Bonnet " " Protection Circuit Y Y Y Y Closed Loop Protection Circuit (or Internal Panic Button Facility) ACC 8 ACC 8 ACC 8 ACC 8 Ultrasonic Interior Sensors Y Y Y Y Additional Terminal Type T1 Length (mm) 232 Secures to vehicle with Thule One Key locks (included) Versatile foot for vehicles with integrated fixed points or flush railings