The dual stage omnisensor is similar to the dual zone Piezo sensor. The dual zone Piezo sensor has dual sensing levels that distinguish between an attemted break in and a slight impact on your car. If someone bumps your car with their door, the alarm will chirp, if the alarm detects a forced entry, the alarm will go off. The omni sensor is the same but it has cliffords DSP(digital signal processing) algorithms to better detect when your car is genuinely threatened. I love clifford's line of alarms, their options are so sweet. I say get the glass break sensor too, it will detect even vibration-less attempts to break the glass. No spring loaded punch window breaking without the alarm going off here:thumbup: