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The CallGuard unit is a universal GSM control and monitoring system. All commands and reporting are done via SMS text messages. The system is worldwide compatible working with all GSM 900/1800 MHz networks and optional 850/1900 MHz networks. Both Pay As You Go and contract SIM cards can be used. The system is extremely flexible and can used as standalone system or integrated to operate an OE or aftermarket alarm / keyless entry system. The CallGuard 2 has the ability to activate accessories and/or other systems by sending a SMS message to the unit.
manufacturers website
This is a personal favourite and can be configured to do almost anything you want it to do. from a remote alarm activation to a remote immobiliser. This unit has 5 outputs that can be configured how ever you want them. just text for a longitude/latitude position and use google maps etc and see where your car is. On holiday abroad, receive a text to say the battery is getting low, send a text and start your car to charge the battery (remote start required)
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