GPS Car Alarm and Tracker Hoping Code Technology Track the car location through GPS signal anytime Check car historic trace & total mileage Set up Geo-fence, over speed alarm Real time tracking on network using GPRS Industrial GSM module can work with 850/900/1800/1900 MHz frenquency Check thecar status and control the car by phone or SMS Three Alarm phone numbers & one SOS phone number can be set Clear English Voice menu for easy operation (Language can be optional ) In car microphone and speaker ensure more convenience and safety to drivers Built-in backup battery, so system can work even when external poweris cut off Full functional car alarm features.