GPS GSM Car alarm system has two remote control units, Lock/unlock door by phone ... for tracking and fleetmanagement.Applies to rental cars,business vehicles ,car ,logistic vehicles ,Taxis ,Construction Vehicles ,Law EnforcementVehicles ,Coach , dump trucks ... and 2 positive triggering); HOT!!! Remote control GPS GSM Car Alarm tracking system with illgeal door-open alarm & Geo-fence&emergency button ...