... / 2 Output / USB Ports GSM sms remote control system( 4 Input / 2 Output / USB Ports ) ... authorized door access, controlling gates, switching of remote equipments, car parking systems. Actually the GSM ... any one of the inputs triggered, will start the siren or switch on the light automatically ... boat, vehicle;13. Energy saving, street lights control system;14. Valve controls;15. Transformer stations; 16. ...