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I am getting a Viper alarm and want to know what is the best sensors out of dual shock or there ultrasonic sensors?

What are the pros and cons with these two sensors?

Depending on which alarm I pick depends on what sensors I want with it, to start with.
 

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Ultrasonic Sensors
Ultrasonic sensors work by monitoring air-pressure levels. The act of opening a door or forcing a window creates a change in pressure which triggers the alarm.

Dual Zone Microwave Radar Sensor
A Microwave Detector works by setting up an invisible bubble which triggers the alarm if entered. A dual zone sensor works like two separate sensors. The outer zone extends outside the vehicle and is usually connected to the "warn off" feature found on many alarms. The inner zone protects the interior of the vehicle.

Dual Stage Shock Sensor
A dual stage shock sensor effectively works like two seperate sensors. The first stage is more sensitive and is usually connected to the "warn off" feature found on many alarms. The second stage is less sensitive and sets off the full alarm if it is activated.
 
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